Keyboard range on certain (historic/old) instruments

I worry that in doing so you would create a lot of sympathetic resonances from lower and higher strings that are not part of the original instrument being modeled, thus changing the timbre of the instrument. In many instruments there is some sympathetic resonance, particularly from the lower strings, even if the damper is fully engaged. But it would be fun to experiment with.

However, I want to point out that practically all of the historical instruments in Pianoteq already have a considerably larger range of notes than that of the real-world instrument upon which they have been modeled.

Therefore I'd like the opposite of what you are asking: a setting to restrict the virtual instrument to the actual range of the strings of each real-world instrument, to remove any chance of stray sympathetic resonances.

Yeah, that's what i remember reading in the manual, but there's no such button. I have the standard version, using the latest (5.2.1) There's a little triangle to toggle the keyboard visibility, and on the right there's a ! panic button, but i don't see a + button anywhere.