Interesting problem you have here. I would start by dragging a chrome window to the right side of the screen to activate the feature that makes that window take up the right side of the screen. Alternatively you can use (Windows Key) + (Right Arrow Key) to move the window you’re in to the right.
When I first installed Brave I found it would start an instance off screen and I couldn’t recover it. This was the best way I found. When you drag one screen to the right or left side it should ask you what you want on the other side and you can select the brave window.
If Windows 7 doesn’t have this feature, I would use (Alt) + (Tab) to scroll through open windows and select brave and then try the (Windows) + (Right) trick to pull it on to your screen.
In the future, you can give us information about your OS and Browser using about:brave by simply copying the version information (there’s a button that can do it for you).
OS Release: 10.0.16299
Update Channel: Release
OS Architecture: x64
OS Platform: Microsoft Windows
Brave Sync: v1.4.2