Context menu appears when selecting text during editing

When editing text in a text box (or any text) in the Axure-editor I (recently?) get an irritating context menu (grey caret down with Services submenu):



Switching off all services in System preferences > Keyboard > Shortcuts > Services does not solve the problem.

Anyone knows a way to disable this irritating behaviour that makes it so hard to edit text?

Working on a MacBook Pro, Axure 9 Team edition, MacOS Catalina.