Balcony windows don t fall off like this, right?

This is usually not a problem, right? I don't know whether the balcony window was installed by yourself or when you bought a house, because the opening angle of the floor window is required by the country, and the general casement and upper hanging windows seem to be not greater than 30 degrees, what you mean should be that the opening angle cannot be controlled within a certain range. Generally, there is no such problem in sliding windows, and the above-hung windows and casement windows generally have support rods (also called limit rods), fixed and adjustable (now they are generally fixed, mainly considering safety issues), and their function is to control the maximum angle of the window, and the other function is to control the size of the open window within a certain range.

And the wooden windows that I hired someone to process by myself don't know if there are support rods.

It won't fall off, unless you artificially get it down, that is the sealant used to fix the waterproof, if you don't worry, you can buy some to reapply, or find a decorator to get it down.