For a detailed discripption how to deplay an app on hololens see: https://docs.microsoft.com/en-us/windows/mixed-reality/develop/platform-capabilities-and-apis/using-visual-studio?tabs=hl2

The following way to deploy an app can be found in Microsoft docs for Hololens Activate Device Portal

Activate Device Portal

On the Hololens activate the Device Portal in Settings -> Update and Security -> For developer

Login/Open Webinterface from developer PC

Open the IP Address (shown in the Hololens For Developer Settings) on a device containing the APPX/appxbundle files (.appx/appxbubdle, certificate and dependencies)

Install App / Sideloading Apps (How to sideload apps on Hololens with Device Protal

open the .appx/appxbudle file, load the certificate and the dependencies if they are needed

Press install and wait for done Start