I have observed this situation when you install an older version of the software on top of the latest version. I think a simple thing you could do would be to reinstall the PSoC Creator 4.3 version and see if it solves the problem.
If the issue persists, we might need to do some registry editing. Looking forward to your reply!
Instead of re-installing PSoC Creator, you can use the Cypress Update Manager and "repair" the version you want to make it the default.
I don't think this is exactly what is happening for me, as I installed v4.3 over v4.2 and not the other way around.
I did try "repairing" v4.3 using the update manager.
No luck, all workspaces still open in v4.2 by default.
Did you try uninstalling and installing PSoC Creator 4.3 again? That should add the required registry keys.
Let me know your observations.
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In my case, I had to uninstall older version of the PSoC Creator (4.2) make 4.3 default. Otherwise 4.2 always took the priority.
You may want to do that, if you don't have any 4.2 or older version specific dependencies.