2 possibilities:
1. You're still using old catalyst driver (the one published in 2019 on msi website)
You start amd settings lite (install it from windows store, it's free - link available on msi's support page for this laptop, in utility section).
In one of the tabs (probably system or preferences), you will find another tab called "switchable graphics"
--> https://www.amd.com/en/support/kb/faq/dh-017
In this tab, you can tell wich GPU must be used for which exe file.
Note: Highest performance means use better gpu (the 5500m); better autonomy means use crappy gpu (the vega one included in the cpu)
This solution doesn't work if you're using amd driver published in july 2020 or a more recent version.
2. You're using the amd driver published in july 2020 or a more recent version
You will have to use window's feature for that.
--> How to Enable High-Performance GPU for Windows 10 Apps or Games | Password Recovery
I really hope, amd will update its support page to tell the second option as the first has dissapeared !
