Variable Selection Dialog's top is obscured and inaccessible when Setting Variable for a Property in the UI Builder Window

Steps to reproduce:

1. Open any Project
2. Create a UIDocument Asset in the Project Browser and open it in UI Builder
3. In the Inspector add a Visual Element and select it
4. Resize the Window and scroll the inspector like in the video example
5. Click the kebab menu that's to the left of a Color Property and select "Set Variable"

Actual results: Variable selection dialog's top is cut off and is inaccessible to users unless they resize the window and reopen the Variable dialog

Expected results: Variable selection dialog fits in the window so that users could scroll up and select the top items in the list

Reproducible with versions: 6000.3.14f1, 6000.4.4f1, 6000.5.0b5, 6000.6.0a4

Can’t test with versions: 6000.0.73f1 (No Variables in selector)

Tested on (OS): Windows 11

Note: Issue also reproduces in Style Selector Variables