Nice to see you here in the Community, @user89. I'll explain below why you can't assign classes in your Chart of Accounts and provide details on what version you can utilize this feature.
The option to assign classes to a specific account in QuickBooks Desktop (QBDT) is only available in the QBDT Enterprise version, and this is only limited to income and expense accounts. This is the reason why you're unable to achieve this with your QBDT Pro Plus 2022. Visit this article for more details about this process: Set up and use class tracking in QuickBooks Desktop.
See these screenshots below for your visual reference:
In addition, you can play around with the reports and use these resources to learn more about what reports are available in QBDT and how you can personalize your data in QuickBooks:
You can count on me to provide further essential resources and details regarding class tracking within QuickBooks. Kindly comment below for any questions you may have. I will ensure a prompt response.