Miawong/sc 48390/kots edit config layout overlaps left menu

[miaawong]

What this PR does / why we need it:

This change improves the responsiveness of the UI when user is on the app config page. Loom: https://www.loom.com/share/3d2b13c978054c1689e9239ab5787d97

Which issue(s) this PR fixes:

Fixes # https://app.shortcut.com/replicated/story/48390/kots-edit-config-layout-overlaps-left-menu

Special notes for your reviewer:

Steps to reproduce

Does this PR introduce a user-facing change?

Improves the UI responsiveness on the configuration page. 

Does this PR require documentation?

NONE