Hi @tdhi,
An additional advice to @AddyEdwin’s one: you could also try to put rectangle on your right side of the screen - between the left nav bar and screen edge.
And then put all the content inside this rectangle.
What could be expected - with this rectangle both parts (left & right) may start to resize proportionally.
Some side notes:
But building responsive web app is not an easy task, unfortunately :frowning In my experience, designing a desktop web app is always done via trial & error.
As I understand, in most cases visual components in Adalo are responsive; so they try to keep proportions but not the exact pixels. However, in some cases the “fixed width” rules appear: usually when you have a small width elements, they remain fixed, while others which are “wider” are responsive.
I’ve spend quite a bit of time experimenting, see this thread & video for example:
Best,
Victor