@Marco Antônio de Almeida Fernandes​ - It looks like you are working out of the "workspace" tab. This is not supported. The python imports are for Databricks "Repos". Please note that file that you want to import will need to be a python file (not a notebook).

Here is an example but just make sure it is in a git repo. https://github.com/rchynoweth/DemoContent/tree/main/PythonImports