To switch account in Clash Royale app on BlueStacks, please follow the steps mentioned below:
1. Click on 'Settings' icon on Clash Royale.
2. Tap on 'Connected' option as shown below.
3. Once your current account is disconnected, click on 'disconnected' option. Here an option will be displayed with all the account that are added on BlueStacks.
4. If no other account is added, you can 'Add an account' as shown below.
Now you can switch between existing accounts.
If you have any further questions, please email firstname.lastname@example.org.