Which client are you using?
Discussion
Wallet of Satoshi
Sorry, which Nostr client?
Damus
From the Home tab click your profile pic in the top left corner. Then Settings > Zaps and there you can change the default 
Thanks a lot for your effort. I thought it was issues with my wallet of sathosi
#nostr
Don’t you think #nostr need to update this things , before every #zap we have to change the amount from #nostr client
That is your default. If you want to change the amount on an individual note, long press on the ⚡️ zap symbol on that post. It will bring up a customization screen where you can change the amount and add a message, set it to private, etc.