Windows 11 is typically preloaded on modern computers. Most models created for the consumer market don't provide the choice to install the more dated version of Windows 10, as the hardware was created to function with Microsoft's most recent operating system. (PCs designed for the enterprise sector occasionally have this feature; however, the cost of these business-class PCs is usually higher.)
Can you purchase one of those new PCs and downgrade it to Windows 10 if you truly dislike Windows 11? I guess, sort of.
While upgrading a Windows 10 PC to Windows 11 is simple and preserves installed apps, settings, and data files, doing the opposite is not possible. You must perform a clean install in order to "downgrade" from Windows 11 to Windows 10, which calls for backing up and restoring your data files and reinstalling all of your applications.
But your license for Windows 11 will suffice to activate Windows 10 (and vice versa), which means you'll still have the option to upgrade to Windows 11 later, after Microsoft has (one hopes) fixed the things that are annoying you right now.
If this is a new PC that came with Windows 11 preinstalled, you might want to think twice about whether you really want to do this. It's possible you'll encounter glitches and hardware incompatibilities when you install Windows 10, and those problems might be even more annoying than whatever issues you have with Windows 11.
If, on the other hand, the PC was originally designed to run Windows 10, your chances of successfully installing Windows 10 are much better. In any case, you should make a complete backup of your system before going any further. (For recommendations of third-party software, including some excellent free options, see "Best backup software (2022).")
The ideal way to do a clean install is to download a Windows 10 recovery image made specifically for your PC model. See this article for instructions on how to find out whether this solution is available for your PC: "How to get a free Windows (or Linux) recovery image for your OEM PC."
If you can't find a recovery image, you'll have to download and install Windows 10 manually. To create bootable installation media, you'll need a USB flash drive with at least 8GB capacity. Microsoft's Media Creation Tool will erase and format the drive, so make sure it doesn't contain any important files.
Caveats aside, here's how to proceed:
When the installation is complete, you should boot into Windows 10, and the operating system should activate automatically. You'll need to install the latest updates, and you might need to download some drivers from the PC maker's website. Once you've restored your data files and reinstalled any apps, you can get back to work.