When you right click (Ctrl+click) a transaction, you'll see following menu -
Add Attachment -
Attach image files to a transaction. This is detailed further in this article.
Create Reminder from Transaction -
Create a Transaction reminder. LINK
Duplicate Transaction -
This will open the New Transaction window and fill in the current information that can be edited.
Show Other Side -
This will open the register of the other account/category involved in the transaction.
Mark as Uncleared -
Transaction becomes uncleared, and the green cleared symbol will be removed from the 'C' transaction field.
Mark as Reconciling -
Transaction is assigned as reconciling, and you'll see a diamond symbol added to the 'C' transaction field.
Mark as Cleared -
Transaction becomes cleared, and the green cleared symbol will be added to the 'C' transaction field.
Batch Change -
Make changes to a single transaction, or multiple selected transactions at one time. LINK
Delete the transaction.
Single Line Mode -
Set the register to display only the Description line entries.
Two Line Mode -
Set the register to display both Description and Memo line entries.
Sort by -
Sort the register by a specified set of variables. Sorting the register is detailed further here.
Sort the register from earliest to most recent date.
Show Transaction Details -
Display all information associated with the transaction in the format it will be saved to the data file. Generally only used for technical support issues.