You can customize the CTA Button in the Checkout Form widget using Elementor.
Follow the steps below to do so:
Step 1: Click on Edit Template
To customize your checkout page in Elementor, click on the Edit Template button.

The checkout page template opens up in Elementor.
Step 2: Edit the Checkout Form widget
Click on the pencil icon on top of your Checkout Form widget.

Step 3: Go to the 'Payment Gateways' section from the left side panel
Here you'll find options to set the CTA Button text, Heading and Sub-Heading of the Payment Gateways section, and the text below the CTA Button.

Step 4: Design your CTA Button the way you want
Navigate to the Style tab and click on 'Buttons'.
Here you'll see a lot of customization options for the CTA Button.
Here are the things you can set from here:
- Make the CTA Button sticky on mobile
- Set the Button width, alignment, and the typography
- Change the color of the button (in normal and hover)
- Set the padding, margin for the CTA button
- Add a border to the CTA Button
and so much more.

Step 5: Save your changes
Click on the Update button to save all the changes made.

That's it! You've now successfully changed the text of the CTA Button in the checkout form.