Hi,

You're missing "Backend," "Clear Cache," and "Debug Window" in your Odoo POS despite administrator rights. First, explicitly confirm your administrator role and check for access to technical settings. Clear your browser and Odoo caches, including restarting the Odoo service and clearing the QWeb cache. Investigate custom modules or POS-specific modules that might interfere. Verify the correct PoS interface is selected and review its advanced settings.

Compare your user settings systematically with a working administrator, focusing on user groups and access rights. Check for JavaScript errors in the browser console. In rare cases, run a database consistency check. Ensure Odoo is up to date. The most likely cause is missing the "Show Technical Features" option in your user's access rights. If all else fails, contact Odoo support.

Hope it helps