Sorry to hear about the trouble with Lightroom Classic. Would you mind sharing the version of Lightroom Classic you're using along with your computer's macOS version? Since when are you experiencing this? Did you start experiencing this after the latest update?
You can try to reset the preferences of Lightroom using the steps mentioned here: https://adobe.ly/2JSym5e
Please backup your presets prior to resetting the preferences.
Let us know how it goes!