Here are the steps you need to follow to remove your wallet from Frontier:
Mobile App
Launch the Frontier Wallet app on your mobile device.
Tap on the More tab.
Under the Wallet management section, tap on Manage wallets.
Select the wallet you want to Remove from your wallet list.
Tap on Delete wallet.
Confirm the action by tapping Delete.
The wallet will now be removed from your Frontier Wallet mobile app.
Web Extension
Launch the Frontier Wallet web extension on your browser.
Open the Wallet switcher to view a list of your wallets.
Choose the wallet that you wish to remove.
Click on the three dots icon located at the top right corner of the wallet's card.
Click on Remove.
Confirm the action by clicking Delete.
The wallet will now be removed from your Frontier Wallet web extension.
Note: You cannot remove your active/primary wallet on the home screen.
If you have multiple wallets, you need to switch to another wallet to set it as your primary wallet and then remove it.
If you have only one wallet, you need to either add a wallet & switch or uninstall the app/extension.