May I know how to solve this problem ? My lightroom

Several postings on this. So many that they get merged into one posting. Basically your GPU driver needs an update.

https://community.adobe.com/t5/lightroom-classic-discussions/p-gray-negative-image-display-in-the-develop-module/m-p/13006731

Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut as that is just so much dead space to us non-Techs.