message in waiting room

How to customize the Waiting Room

You can customize the Waiting Room title, logo, and description at an account, group, or user level.

Note: You will need to enable Waiting Room before you have the option to customize it. If the Waiting Room has been previously customized at the user level then disabled after, when Waiting Room is enabled in a meeting's settings, the meeting will use the user-level setting until it has been reset, or the account setting has been locked . 

1. After enabling Waiting Room, scroll to the Security section.
2. Click Customize Waiting Room.
   This will open the Waiting Room customization options.
   
   • Title: Click the pencil next to Please wait, the meeting host will let you in soon. to update the meeting title. Click the check mark (✓) when you are done.
     Note: Titles are limited to 64 characters.
   • Logo: Click the pencil icon to upload a logo.
     Note: Logos can be in GIF, JPG or PNG format. They cannot exceed 1MB. The minimum height and width is 60px and the maximum is 400px.
   • Description: Click Add waiting room description to add a description to the Waiting Room.  Click ✓ when you are done.
     Note: The description is limited to 400 characters.
3. Click Close when you are done.
4. Participants will see your custom Waiting Room branding when they join the meeting.

https://support.zoom.us/hc/en-us/articles/115000332726-Waiting-Room