I just came to Bitwarden from Keepass, where I could easily search everything easily, even partially matched.
I have put my credit card number in the Notes section under my bank in Bitwarden.
Eg: 529565216559641
Now, how do I search for partial matching, such as searching for the “6521” and having Bitwarden return everything that includes this term, including that credit card number in the notes section.