The Battle.net client does not open in full screen

Hello, dear developers! Please note that on my 1440x900 monitor, the Battle.net app won’t open full screen unless I do this myself. It runs in windowed mode, I have not found the appropriate setting for the application to run in full screen. In general the interface of the new version of the application is very nice and worthy of praise, if only for this one unpleasant thing. I want to add that the manipulations with clearing the cache and other things did not help. I already contacted support and did everything they recommended. I was advised to contact here. Thank you for your consideration!