When the formula bar is activated, you can see all of these options: the Edit Formula button, the Cancel button, and the Enter button. Let's break down what each of these buttons does:

1. Edit Formula button:
- The Edit Formula button is represented by an "fx" symbol or a small button with three dots.
- Clicking on this button opens the formula editor, allowing you to modify the current formula or create a new one.
- It provides a user-friendly interface where you can enter or edit formulas using functions, cell references, and operators.
- This button is particularly useful when you want to make changes to complex formulas or troubleshoot formula errors.

2. Cancel button:
- The Cancel button is represented by an "X" symbol or a small button with an "X" mark.
- Clicking on this button cancels any changes made to the formula and restores the previous formula.
- It is handy when you accidentally modify a formula and want to revert to the original formula without any changes.
- The Cancel button ensures that you can discard any unintended modifications and maintain the integrity of the formula.

3. Enter button:
- The Enter button is represented by a checkmark symbol or a small button with a checkmark.
- Clicking on this button confirms the changes made to the formula and updates the cell with the new result.
- It is used to finalize the formula and apply it to the selected cell or range.
- Pressing the Enter key on the keyboard also achieves the same result.
- The Enter button is essential to ensure that the modified formula takes effect and provides the desired output.

Having all these options available in the formula bar allows users to easily edit, cancel, or confirm changes to formulas, providing flexibility and control over the calculation process. It streamlines the formula editing experience and helps users avoid errors or inconsistencies in their calculations.