New Canary Edge issue

Since the latest update to .4157 on Canary Edge the

browser window behavior has changed.

I always have 2 browsers open, Edge Canary and AOL.

I can switch easily between the 2 from the Taskbar.

Starting today if I go to AOL and then try to go

back to Canary instead of opening the whole browser

it gives me the option of going back to 2 of 3 browser

tabs I have open.

What has changed?