If you use the GNOME onscreen keyboard (OSK) with word suggestions enabled, you've probably noticed that the keyboard "bounces" or changes height dynamically when the suggestion bar appears and disappears. This is extremely jarring, especially on a 2-in-1 device or tablet.
This guide provides a clean, native CSS fix to force the suggestion bar to a static height, eliminating the bounce without needing to disable ibus-typing-booster or install heavy third-party keyboard replacements.
You need the GNOME Tweaks tool and the User Themes extension to allow GNOME to load custom shell CSS.