None of Editor tooltips aren't shown when in Play Mode
Unity: IMGUI Framework
As Designed
2023.2.X
2023.1.X
2022.3.X
2021.3.X
This was an intentional choice, to help with performance during playmode. You can enable playmode tooltips via Preferences > General > Enable PlayMode Tooltips.
Reproduction steps:
1. Open the attached project “TooltipBug“
2. Enter Play Mode
3. Hover mouse over the Pause button
Expected result: Tooltip is shown below the button
Actual result: Tooltip is not shown below the button