You wont be able to do that in the Lite Version of OWA.
If you want to use the Premium version follow these steps:
https://learn.microsoft.com/en-us/exchange/troubleshoot/outlook-on-the-web-issues/outlook-web-app-unexpectedly-opens-in-the-light-version
OR use a supported browser:
https://support.microsoft.com/en-us/office/learn-more-about-the-light-version-of-outlook-2aec8c2d-da48-4707-ba37-c800e1c284cd