You can only store 100 scenes in the mixers, you can create show files that contain the scenes saved on the mixer. Show files are saved to a USB stick, after the first show file is saved build up the next group of scenes and save another show file with a different name.
At some point during the show you would need to load the next show file into the mixer.
To control scene recalls look at the Q Control app, you can custom program buttons on that for many functions, including scene recalling.
You can turn off the scene load verification option so the selected scene loads with a single button push.
The soft key buttons can be programmed for scene recall functions as well.