Please follow the below steps.
> Go to Lightroom > Preferences.
> Click on the General tab
> Uncheck “Show ‘Add Photos’ Screen”
> Restart Lightroom
If this doesn't help, please follow these below steps to check for the issue
> Go to Lightroom > Preferences
> Click on Presets Tab
> Disable Apply auto tone adjustments
> Click on Performance tab
> Disable Use Graphics Processor
> Restart the machine
> Launch Lightroom and check for the issue
Let me know if this helps.