You can sort rooms on the Calendar page and the Units page by using the “Sort by” filter, found in the top right corner.

If this doesn’t help, you probably need to rename the rooms slightly. For example, instead of calling them “Room 1”, “Room 2”, “Room 10”, “Room 11”, etc; rename them “Room 01”, “Room 02”, etc. In other words, include preceding zeros so that all rooms have the same number of digits. After that you should be able to sort them using the “Sort by” filter.