Redirecting to default section on site

Appian interfaces do not persist state. The only way to solve this, is by either opening the record in a second tab, or by embedding the record UI as a child.

What do you mean by "by embedding the record UI as a child."? Can you elaborate?

You create a UI that you call to be displayed inside your parent UI.

Well, thats what I am currently doing, calling record UI on parent interface

From what I see on your screenshots, you navigate the user away from your site page to the record. When the users clicks "Back" in browser, the site page is reset. Is that correct?

I suggest to replace the grid with the UI record when the user clicks.

a!localVariables(
  local!subNavSections: {
    a!map(
      sectionName: "Quick Links",
      subsections: { "Workspace", "Tasks",  }
    ),
    a!map(
      sectionName: "Favorites",
      subsections: { "My Time", "Expenses" }
    )
  },
  {
    a!columnsLayout(
      columns: {
        a!columnLayout(
          contents: {
            a!forEach(
              items: local!subNavSections,
              expression: a!localVariables(
                local!parentSection: fv!index,
                {
                  a!richTextDisplayField(
                    labelPosition: if(fv!isFirst, "COLLAPSED", "ABOVE"),
                    value: {
                      a!richTextItem(
                        text: fv!item.sectionName,
                        size: "MEDIUM",
                        style: "STRONG"
                      )
                    }
                  ),
                  a!forEach(
                    items: fv!item.subsections,
                    expression: a!cardLayout(
                      contents: a!richTextDisplayField(
                        labelPosition: "COLLAPSED",
                        value: {
                          a!richTextItem(
                            text: {
                              a!richTextItem(
                                text: fv!item,
                                color: "ACCENT",
                                size: "STANDARD",
                                style: if(
                                  and(
                                    local!parentSection = ri!activeSubNavSection,
                                    fv!index = ri!activeSubNavSubsection
                                  ),
                                  "STRONG",
                                  "PLAIN"
                                )
                              )
                            }
                          )
                        }
                      ),
                      link: a!dynamicLink(
                        saveInto: {
                          a!save(ri!activeSubNavSubsection, fv!index),
                          a!save(
                            ri!activeSubNavSection,
                            local!parentSection
                          )
                        }
                      ),
                      style: if(
                        and(
                          local!parentSection = ri!activeSubNavSection,
                          fv!index = ri!activeSubNavSubsection
                        ),
                        "ACCENT",
                        "NONE"
                      ),
                      showBorder: false,
                      accessibilityText: if(
                        and(
                          local!parentSection = ri!activeSubNavSection,
                          fv!index = ri!activeSubNavSubsection
                        ),
                        fv!item & " " & "selected",
                        ""
                      )
                    )
                  )
                }
              )
            ),
            a!cardLayout(
              height: "TALL",
              showWhen: not(a!isPageWidth("PHONE")),
              showBorder: false
            )
          },
          width: "NARROW"
        ),
        a!columnLayout(
          contents: {
            choose(
              ri!activeSubNavSection,
              choose(
                ri!activeSubNavSubsection,
                a!sectionLayout(
                  label: index(
                    index(
                      local!subNavSections.subsections,
                      ri!activeSubNavSection,
                      ""
                    ),
                    ri!activeSubNavSubsection,
                    ""
                  ),
                  contents: {}
                ),
                a!sectionLayout(
                  label: index(
                    index(
                      local!subNavSections.subsections,
                      ri!activeSubNavSection,
                      ""
                    ),
                    ri!activeSubNavSubsection,
                    ""
                  ),
                  contents: {}
                )
              ),
              choose(
                ri!activeSubNavSubsection,
                a!sectionLayout(
                  label: index(
                    index(
                      local!subNavSections.subsections,
                      ri!activeSubNavSection,
                      ""
                    ),
                    ri!activeSubNavSubsection,
                    ""
                  ),
                  contents: { rule!JS_RightContent() }
                ),
                a!sectionLayout(
                  label: index(
                    index(
                      local!subNavSections.subsections,
                      ri!activeSubNavSection,
                      ""
                    ),
                    ri!activeSubNavSubsection,
                    ""
                  ),
                  contents: {  }
                )
              )
            )
          }
        )
      },
      spacing: "SPARSE",
      showDividers: true
    )
  }
)

This is the parent interface in which I am calling 'rule!JS_RightContent()' interface(139th line) which is just a gridfield.

For what it's worth, this is a good example for why I typically set my Record Links to open in a new tab - so when the user is done with the record they've opened, they merely close that tab and the original interface will still be in the state they left it.

For what it's worth, this is a good example for why I typically set my Record Links to open in a new tab - so when the user is done with the record they've opened, they merely close that tab and the original interface will still be in the state they left it.