Popup Menu

The picture in you original posting and popup menu shown, indicates the file you are working on is a Picture file ( png or jpeg extension ). As such - the text is Part of the Image and can not be Selected like one would do in a Word, TextEdit, Pages file. The additional Popup menu is showing several Options like " Trim, Create PDF and Markup " - all clearly indicate this is a Picture file.

If you want to copy only certain text from the image - you will have to invoke the " Create PDF file" once that is done - Now work in the newly created PDF file and you can select any part of the Text and do what you want - like copy and paste to another Application.

Apple Icon on Desktop >> System Preferences >> Trackpad and UnChick " Secondary Click " OR Same >> Mouse and UnCheck " Secondary Click ".

Is this an Image file like png, jpeg and in what application is this occurring ? Please in context would help.

You seem to be Right Clicking the Image and as such Activated the Secondary Actions / Menu you want to get rid of.

Ah - the missing link ( Application ) is revealed, MS Word ! Now that changes everything. Suggest contacting Microsoft for a solution as this is their Software.