Currently, on iPadOS, the app is stuck on either "mobile layout" or "desktop layout" based on the initial launch window size. If you try to resize the window, it won't resize properly/responsively.
For example, launch Mochi in "compact" layout first, wait until it finishes loading, and then resize to full screen gets you a "blown-up compact" layout.
Vice versa, launch Mochi in full-screen and then try to downsize it, it'll end up breaking many UI interactions (e.g. hamburger menu doesn't come out, etc..)