Strange feature of POWERPOINT 2

What is the use of the menu bar option circled by a green brush（更多/more）?

I clicked but didn't respond.

version：Microsoft® PowerPoint® 适用于 Microsoft 365MSO (版本 2307 Build 16.0.16626.20170) 64 位

To replicate the issue here, you need to use ctrl A to select all the contents in a text box, and then right-click the selected text to pop up this menu.