1st you have to enable your governor menu.
you do that in the same master menu as setting swash type etc.
Once you do that, turn off, restart, go into your normal menu and you will have a gov menu now.
You must set some percentages in there for each flight mode.
Mine are on average about 30-40% apart.
Dont stress too much about those numbers yet.
Setup your GV1 as normal, set your desired HS for each flight mode.
You can now fine tune those with the % in your gov menu if required, or on the fly at the field.
Do a search as well, there is some very good in depth how too's on doing all this from start to finish.
For the love of the hobby