2nd monitor blurs when using 100% in develop mode in Lightroom Classic

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Problem. I use a MacBook Pro 2019 with a external monitor. Everything was working well until I updated to Lightroom Classic 10.3. Since then when using the develop mode with loupe at 100% the image starts out clear then as soon as I work on the image the quality degrades and won’t become clear until I change to library mode.
Updating to version 10.4 has not fixed the problem.
 
I've used the chat support bottom right at the link below. Once you get past the automated responses you can get the right person. If need be they will control your system remotely. One thing they tell you is to connect both monitors into one graphics card, as Lightroom doesn't support multiple cards.

 
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Thanks for your help. I went through Adobe support and after controlling my computer could not solve the problem . They want me to go back to an earlier version. Other people with the same problem have also been told to do that.
I will try Ken‘s suggestion next.
 
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