You can show your menu links on a header by applying following steps…

Open Admin Dashboard

Step 1)) Admin Area >> Appearance >> Menu

Step 2)) Add Menu Name and click on create menu.

Step 3)) Add Menu Name (page) show website main menu.

Step 4)) Click Add to Menu Button.

Step 5)) Set Primary Menu

Step 6)) Save Menu

https://prnt.sc/fhcunt

Hope this will help.

Thanks

Thank you!