As a user, you can manage your personal settings.
To access your personal settings:
Click on your profile picture in the top, right corner of your Nextcloud instance.
The Personal Settings Menu opens.
Personal Settings Menu
Choose Settings from the drop down menu.
The options listed in the Personal Settings Page depend on the applications that are enabled by the administrator. Some of the features you will see include the following:
Source: Accessing your files using the Nextcloud Web interface by Nextcloud GmbH is licenced under CC BY 3.0.