How do I see all transactions in a category for specific dates?

Create a Category Detail report and limit the report to the category you want to see. Choose a "Custom" date range and configure it to cover a large period of time so that all transactions are covered, as pictured here:

Once you've finished creating the report, you will see the details of all of the transactions that make up the category you requested. Feel free to print the report or save it to a PDF file. Click on any transaction to view and edit it in the account register where it was recorded.