I was just wondering if there was a safe way to display my total bitcoin balance easily in one total.
If you have a fully synced Bitcoin Core with complete blockchain (
not pruned),
you can create a watching-only descriptor wallet and import all of your master public key there with
importdescriptors command.
You can still do that with a pruned blockchain but you'll have to resync from scratch when you need to rescan the blockchain for balance.
Here's the guide on how to do it:
https://bitcointalk.org/index.php?topic=5399337.msg60178631#msg60178631If you're limited to Electrum, then it's not possible since it can't accept multiple master public/private keys/seed.