How to remove password on watch-only wallet on Android?, because it's not necessary as it should be on desktop.
There are two types of encryption, one for seed/private keys and the other for Wallet file which is activated by default since version 2.8 for privacy reasons.
Choosing an easy password is best (if you try to change the password, there is no option to create a new blank password)
https://electrum.readthedocs.io/en/latest/faq.html#how-is-the-wallet-encrypted