Open the table and click the Insert tab above. Click the formula in the upper right corner of the interface. Click View in the menu bar above. Find the toolbar in the drop-down list of the view, click Open, and finally you can see that all the toolbars for editing mathematical formulas are displayed. Detailed steps:

1. Open the table and click the Insert tab above.

2. Click the formula in the upper right corner of the interface.

3. Click View in the menu bar above.

4. Find the toolbar in the drop-down list in the view, and then click Open.

5. Finally, you can see that the toolbar for editing mathematical formulas is displayed.