Hi Diki
Whether the various reverb sections changes with each preset is optional. (You just select what you require)
When you have adjusted the reverb from the effects tab, choose Save followed by OK (This will maintain the setting) before returning to the Main Screen,.
As well as Global, the Reverb, Mixer, Chorus etc can be set per voice, (Voice Edit) Main Section, (Manuals, Styles/Sequencer, Drums, Mic/OX7 and Additional such as Harmonizer etc) and Individual Section (Drawbars, Longwave Sounds, Real Drums, Waves/MP3, VST 1,2,3, 4 and audio Input 1 and/or 2)
Hope this helps

Bill