How to disable or get rid of this red square box? It appears when I am single clicking the text "connected" (however, it will appear upon single clicking anything in that square region)

This is how the issue looks


This is how it normally looks (when I haven't clicked in the red square region)

enter image description here


This issue is common for all pdfs, only most of the pages. This doesn't happen when viewing the same pdfs in other pdf viewers, for eg, preview.

It started around 6 months, only decided to post this today.

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