N'Geal
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Well, you need to go into the game and change the resolution!
Or forcibly change it in the file - the path to the game is ... \Heroes of Might and Magic V - Tribes of the East\profiles\default_profile\user_a2.cfg
setvar gfx_resolution = 1920x1080
The problem is that I already have the resolution set to 1920x1080.
The screenshots themselves are quite large, so I'm providing links so you can understand what I'm talking about.
https://1drv.ms/u/s!AnAuQ-haza5b3xecnw5Qsn36IQPR
https://1drv.ms/u/s!AnAuQ-haza5b3xRnZp6bO8oyOn7X
https://1drv.ms/u/s!AnAuQ-haza5b3xWk6CgEdgnWB2E6
https://1drv.ms/u/s!AnAuQ-haza5b3xag7ApOJBUkEGmC