Are you using the original Acer AMD GPU driver that came with the laptop or did you upgrade using a generic AMD GPU driver from AMD Support?
This link from AMD Forum should guide you on how to activate the RX-550 on your laptop: How to Configure Laptop Switchable Graphics.
Sorry, The link says to go to "Additional Settings" which means is useless to you.
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No more "additional settings", most are now built into the UI, what options show when clicking the "switchable graphics" button ?
There's no new "How to" as yet, amdmatt
Yes we're working on it folks.
To switchable graphics controls, go to Radeon Settings > System > Switchable Graphics.