You can actually disable the dynamic checkout buttons (express checkout) from within your theme editor.
Head over to Admin > Online Store > Themes > Customize > Product Pages > Toggle 'off' dynamic checkout buttons. I've created a video recording to show you the process, here.
If there is anything else I can help you with, please let me know.
Thanks for your quick response. I have tried this option too. It only disables the Express checkout at product page. But I want to disable the checkout buttons at Checkout page also.
Please find the attached screenshot
Mine in Venue theme. Please suggest me the best option to remove these Express checkout at checkout page.
Thanks & Regards,