Clicking on this symbol will lock the padlock and protect the individual properties from being changed by accident. Every property that can be edited in the timeline has a segmented line: the keys are placed in the top half, and under them, the link between the keys is shown by a ...
If you break something ("a happy little accident" as Bob Ross put it), then you can always backtrack a little to a known working point. A high percentage of users report both learning PySimpleGUI and completing their project in a single day. This isn't a rare event and it's not ...