Android 15's App Freeze feature helps clear phone storage space without deleting apps. This feature archives unused apps, freeing up storage space on your device. To use it, open Settings > Apps > See all X apps, then toggle "Manage app if unused" to On for the desired app. You can also manually archive apps or wait for Android to do so after a period of inactivity.

Source: https://www.zdnet.com/article/how-to-use-android-15s-app-freeze-feature-to-clear-space-on-your-phone/#ftag=RSSbaffb68