Using version 18.104.22.168 (Official build) dev (64-bit) installed on 2 laptops.
In Settings you can adjust the default zoomlevel applicable for all web pages.
On web pages you can set a specific zoom level for that web page.
On one laptop this specific web page zoom level is remembered the next time you open Edge, as it should be I expect. However on the other laptop web page zoomlevels are not remembered and set back to the default level when you close and re-open Edge.