hi Lester_Chan, welcome to the community!
I saw that frederic_Horcholle also replied to your post, it’s great to see the community helping each other. I wanted to add an additional note about your proposed setup. Frederic is correct that you will need to create a custom resolution for your layout but please also note that you may need to set a custom size for the player window as well.
If you go to the Displays menu in your CMS, click the button at the end of the entry for your player and choose Edit from the menu. When the Edit Display window opens, go to the Profile Settings tab and you will see options named Width, Height, Top, Bottom as shown in my screenshot below. You will need to set the same width and height to match your total screen resolution, to ensure the player window fits your display correctly:
I hope this is helps with your player setup, just in case this is going to require multiple displays connected together I have included a link to our video wall guide as well.
Many Thanks.