Dear All, I have a problem which is repeating again and again. I instaled and deleted Lightroom classic several times on my pc and the problem is still there. Presets are available for a time then dissapeared. All presets dissapeared after I try to open the presets panel in develop mode. Not only that, but the snapshot, history and collection panel is duplicated after I try to open the presets. Here is the picture, see the duplication on the dottom. I'm desperate.
Have you considered resetting the preference file? Resetting the preference file us Adobe speak, for deleting the preference file, as to force LrC to create a new preference file upon launch. The preference file can get corrupted, leading to buggy behavior. The preference file will survive uninstalls, reinstalls, and upgrades, so your reinstall would have not fixed it.
Note that a side effect is some or all settings in preferences may revert to defaults.