Different types of notes in the deck after merging

Hello
I merged several decks into one and now I have two types of notes, one 3599 bass and the other 3599+, can it be unified?

Sure! Note types with strange names - Frequently Asked Questions

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point 4 of this manual says to select Edit - Change note type but I don’t have this option, after expanding Edit
I have
Undo
Select All
Select Notes
Invert Selection
Create Filtered Deck

Try Notes > Change Note Type instead. Browsing - Anki Manual

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