Tilting the power awning is a popular topic. Do a Search on "awning tilt" or similar and you will find lots of Threads. Here are a couple to wet your appetite.
https://www.montanaowners.com/forums...ad.php?t=81053
https://www.montanaowners.com/forums...ad.php?t=80354
You can extend the awning as far as you like until the rain flap is vertical. If you extend beyond that point some awnings will roll up backwards toward the RV,