Hey, so this is a forum for the Python language. For Spyder issues, we’ll be able to provide you better if you could report the issue on our issue tracker, either using the built-in reporting feature or manually providing all the detailed requested by the template. Furthermore, as also advised by our error dialog, please search the error message on our issue tracker and/or your favorite search engine before reporting, as you’ll be able to get much quicker help.
In this case, as the first few hits on both point to, the issue is spyder-ide/spyder#17616 and has already been fixed in Spyder 5.3.0, which we released some time ago. However, Anaconda still has not updated their version to it (their latest being 5.1.5), which we have no control over.
For an up to date, fully supported and tested version of Spyder, you can either install it from Conda-Forge in a fresh Anaconda environment, or from our standalone Windows installer, as Carlos describes in his comment there. It will still work with all your existing environments, provided you update the version of spyder-kernels in them to 2.3.0 or later (which you may need to install from the conda-forge channel as well, if Anaconda is still not up to date).