Hopefully, you have previously-made backups of the contents of all partitions created prior to these storage changes.
Using Disk Utility from Recovery (if that still boots), erase the entire storage device, re-partition it for APFS, and re-install macOS.
After erasing and re-partitioning storage for macOS, use Boot Camp Assistant to re-install Microsoft Windows, or probably more flexibly re-install Windows as a guest of a virtual machine running on macOS.
Once Windows is installed in a partition, the only way to manage that partition is with Boot Camp.
Pragmatically, the fundamental purpose of partitioning is to allow user data to be corrupted. As an incidental, secondary, and far from assured usage, partitioning also allows sometimes-compatible operating systems to get tangled and to then selectively corrupt other co-resident operating systems. On an unusually good day, partitioning allows for operating system coexistence, when carefully and cautiously administered.
If you want to learn how partitioning works, I strongly recommend using a spare, empty disk, and preferably a spare Mac. If you lack a spare Mac, then ensure all connected storage is backed up appropriately, and avoid modifying (or clobbering) any of the in-built internal partitions used for the Mac itself (such as the EFI partition) and those for macOS.
