in Cubase 10, is it possible to remove at once all the plugins loaded in the VST Instruments rack (the one you open pressing F11).
Unfortunately this is not possible.The only one way is one by one, to change all instruments to No Instruments. All the Rack slots will remain.
Thanks for confirming it.
It should be a function to add, sometime it needs to save the project without VST instruments loaded (as safe backup) and in some project it needs to unload 20-30 instruments or more one by one, not the best…