How can I add the fixtures I created in the fixture editor in the fixture list:

[luizhscaff]

I tried looking by the manufacturer name I put it there, but then I didn't find it, then I tried looking at the fixture name I put it there and also didn't work, If someone could help me I will be very grateful

[MichelSliepenbeek]

If you read the on-line manual, you will find:

Important note: for many reasons, you SHOULD NOT save or copy your custom fixtures in the QLC+ system fixtures folder. The most important is that when you uninstall QLC+, the system fixtures folder gets deleted, so your fixtures.
You are recommended to save them in the user fixtures folder.
To find it, please refer to the Q & A section of this documentation.

4 Q: Where is the QLC+ user folder located in my system?

A: The user folder is where user fixtures, input profiles, RGB scripts and MIDI templates go.
It changes depending on your operating system:
Linux: it is a hidden folder in your user home directory: $HOME/.qlcplus
Windows: it is a folder in your user (e.g. MyUser) directory: C:\Users\MyUser\QLC+
Mac OS: it is located in your user "Library" directory: $HOME/Library/Application\ Support/QLC+
You can reach any of these folders from a terminal with the 'cd' command. For example:
cd $HOME/Library/Application\ Support/QLC+
Please keep in mind that fixures and input profiles found in the user folder will have precedence over the same files in the QLC+ system folder.