7680x4320 or 4320x7680
are the highest resolutions atm in Bakin, you can set it yourself.

2560x1440 or 1440x2560 ...is the closest Bakin offers to your resolution above but they also do offer... 3840x2160 or 2160x3840

yes that working, but I am talking about the ratio. Its showing up in 16:9 but only cuted off with big back borders on the left and right side, like watching an old movie in 4:3 on a new 16:9 TV. So my question: is it possible to get the game running in 16:9 using the complete monitor without the black bars on the sides or have I to move on to e.g. unity to have a 16:9 ratio and not 4:3 ratio from last century? 😬

引用自 Sebastian：

yes that working, but I am talking about the ratio. Its showing up in 16:9 but only cuted off with big back borders on the left and right side, like watching an old movie in 4:3 on a new 16:9 TV. So my question: is it possible to get the game running in 16:9 using the complete monitor without the black bars on the sides or have I to move on to e.g. unity to have a 16:9 ratio and not 4:3 ratio from last century? 😬

That's a completely different question to your OP.
The answer to your 2nd post, and Bakin's standard ratio is 16:9.. there must be something wrong with your settings on your end.

Um... Bakin is 16:9 by default. I was thinking of trying 4:3 for my project, but decided to leave it alone. So, yea, if you're not getting 16:9, I'd say it's something on your end (i.e. a setting issue), not with the program by default.