Welcome to the forum.
You need to provide more information for us to help you for instance -
- Programming IDE e..g. Processing, Eclipse, VSC …
- Processing version e.g. 4.5.6
- Programming mode e.g. Java, p5.js, Python
- Are the windows created from a single sketch in which case how do you create them
There are probably other questions that might need answering later.
In the meantime I suggest you read the forum guidelines on asking questions.
