You need to use the command "start" which will allow you to execute a program and then immediately exit the batch file leaving the program running.
Quote:
START
Start a program, command or batch script, opens in a new window.
Syntax
START "title" [/D path] [options] "command" [parameters]
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More at
https://ss64.com/nt/start.html - no affiliation with this site, just came up in Google results