There are 3 options for Player Size under the Player Customization. Each will define size of the player i.e video on embeded page as follows:
- Responsive player will stretch within parent element (width & height);
- Responsive (fluid) player will stretch width to parent element but will maintain height aspect ratio.
- Fixed player will be in defined size (width & height)
You can test and try different sizes to find the one that best suits your needs. Simply click on Edit Icon for specific player on Players page in dashboard, and under the Player Size field select desired size.
P.S- once change is made it could take up to 15 minutes for local cache to clear on all servers in order to preview new settings of a player.