Goal: Add a header that fits the full screen width, with two menu items.
Issue: When navigating between pages using the header, the screen flickers. The header briefly shrinks and then grows back to full width.
Root Cause (suspected): I can see in DevTools that the --retool-widget-multi-column-width CSS variable changes during page navigation - dropping to around 1160px before recovering to 100%. This appears to be what causes the flicker.
Steps Taken:
I compared two apps - one using the old header component and one using the new header component. The flickering only occurs in the app with the new header component. The issue did not exist before a recent Retool update, which also introduced a new option: "Fixed position when scrolling" in the header's appearance settings.
I have attached screenshots showing the affected header element in DevTools and the new header configuration panel.
Environment: Retool Cloud
