How to Remove/Hide a Full-Screen Button from the Widget

Hi,

Please check if the script is applied to the Tabber widget itself or to the specific widget you used in the Tabber code. I assume that each of these widgets could have their own full-screen button. 

For example, for the Tabber widget the code I used (with 'Show title in view mode' toggle on') is on the screenshot below:

And the same script could be applied to the widgets you set under widget.tabs in the Tabber code (take the id of the widget and open it in Edit Mode to add the script):

Hope it helps to achieve your goal!