Team Owners* may define Sharing Preferences for their Team Members and all other Team Administrators. This means you can effectively choose what will be shown as available sharing options in the User side. Any options you toggle "off" will be shown as grayed out on the User side.
Regardless of your choices here remember that: Direct Share, Share to Group, Embed, and Clone are all Pro privileges. Weblink is the only Share option for Standard users regardless of other choices made in this menu.
1. Go to Setup>>>Security: Sharing
2. Toggle on and off the sharing options you would like your team members to access:
*Important note: Team Owner privileges supersede regular Team Administrators. Managing sharing preferences is a Team Owner privilege and cannot be altered by other Team Administrators. Not sure if you're the Owner? Check the top left corner of your Admin Portal page: