Hi Zoe,
When these dialogs were created the monitor resolutions were much smaller than they are today, and the dialog window was made to a certain size, and doesn't scale. Now that monitors are supporting 4k, the dialog displays very small, as you have observed. The plan is to fix the size so that it adjust to an appropriate size depending on the screen resolution. For now, you can certainly adjust the resolution size to have the dialog window display in a readable size, but eventually, you won't have to do that.
--
Maria