Hello, my wallet (Ledger Nano S) changes the address after every transaction. I know that it is because of security reasons (worse to track, I guess) but I want to have fixed address.
Its not for "security reasons", its for privacy reasons.
You can use your address as often as you want. Just don't use the new receiving address.
But there is not a single advantage of using the same address over and over again. Not one.
Can you tell me the right Bitcoin software wallet with fixed address or how to disable this on Ledger?
Generally every wallet will create a new receiving address. This is made to encourage the use of a new address for every transaction.
But you can still use the old address.
I would suggest electrum (
https://electrum.org/#home). Electrum can be used as a GUI for your nano s.
Electrum creates 20 addresses at once. You can stay with only 1 used address without any problems.