I'm no expert but I just ordered these from Amazon:
Skyreat New DJI Mavic Air/Mavic Pro,DJI Spark Accessories,Aluminum Foldable Tablet Stand Holder Extender with Lanyard for Mavic Air/Mavic Pro/Mavic Platinum,DJI Spark Remote Controller
Foldable Monitor Sun Hood, Cell Phone - Tablet Sunshade Sun Visor Cover for DJI All Series, Compatible with DJI Mavic Air / Pro / Spark / Phantom / Inspire / Osmo (L168)
I used this sunshade with my phone and it worked well. About $30 all together.