How to clear synched Photoshop presets?

Thanks for the prompt reply.  This issue - and the attached warning (see img)when opening PS had been continuing for months, only managed by not syncing presets.  As below, I have mostly fixed it.

In essence, to change synced presets I needed to work with Photoshop that had preferences reset etc. and then allow Preset Sync,  DELETE all the presets that were synced, until preset status showed they were all gone, (see img) and then load up my saved presets as desired.  Note (for others) that when I said NO don't keep my presets on the cloud, when turning off Preset Sync, (see img) they were still there when I came back.  I had to manually remove everything).
It took a few rounds of deleting presets, closing PS and reopening to clear all the presets from Sync.  (Some seemed very stubborn) Then I could import presets and arrange what I needed.

[The part that wasn't mentioned in the how-to, was to ensure I had exported and saved any presets that I wanted access to again - like shapes, patterns, gradients etc. - saving them OUT of the Adobe folders.
I think this gets missed by most Adobe consultants and should be included whenever a reset of some kind is suggested. I have seen and heard many, many users that have lost presets or other settings (like modified workspaces, actions and more) because Adobe got them to reset everything.  There must be ways to keep copies of some of these and re install as needed..? ]
QUESTION:
What number of each preset - swatches, patterns etc. is the maximum for sync (see img) and what is the quantity that won't mean Photoshop is very slow to open?  Or is it the file size of the .pat or .grd or .asl  etc that will affect performance?