Agree +1 Vote. This was suggested once again recently here: Use LingQ without importing lessons - #8 by Oshikuru (and I agree with also having a similar tool to Language Master where we don’t have to leave YouTube or a streaming service)
Rooster Tools / Language Master made a way to do this but from my experience it’s never been easy to set up. You may have better luck. I think it even requires some monthly subscription now as it added AI (or maybe not, Idk the site details and tools are so packed with information it confuses me unfortunatly). I wish LingQ would add this already.
For now this has been the best/easiest fix to set up (clickable link): LingQ Addon
Here is the thread with instructions: Change the default youtube size/location in lesson with Userscript - #6 by vet8t6z79pc4
But if LingQ would just add the ability to open the video to full screen and clickable subtitles to do the LingGqing, for a full screen video (web and mobile) then that would be epic.