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Is this a fullscreen window?
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You sound like you’re having bigger issues with your Mac.
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Why did you reinstall? That would have removed critical data for troubleshooting. Reinstallation should not be something you try early in the troubleshooting process.
When the application is stalled, do a Spotlight search for Activity Monitor . Select our application in the list of processes - it should show “(Not Responding)” and the name in red - and press Command-Option-S to run a sample on it. When the sample window opens, press the Save button and save it to your Desktop.
Hold the Option key and choose Help > Report bug to start a support ticket and attach the stall report.
