Can i change App builder size

Hello,

Can I change the width of the left and right side of the app layout like in this image

At the moment, the default App Builder template has a fixed responsive behaviour, where the size of various containers cannot be updated. We are evaluating the best way to allow for more flexibility, either by letting users specify the width and/or height of various containers, or by switching to a grid system. Some new layout options should be available in Q3.