"preview" do not work

https://imgur.com/mRvhBk7

i want to use preview function.

but it does not work.

it only works after i upgrade the page.

help me.

Hello,

I saw the screenshot you attached. Please deactivate all the third party plugins, activate parent theme, clear browser cache and check back. If the problem continues then please provide with admin panel login details of the website to check it myself and help you out accordingly.

Best Regards..

[Author]

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