Problem with menu on article page

Hello Łukasz,

Blog pages and post pages use your default theme header and footer. Your active site's theme is different from the plugin theme.
You need to update your theme file to be the same as your current plugin theme header/footer.
...................................................
Sincerely,
Anna.
Nicepage Support Team

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if I will put only new theme with correct menu will it be okay on the site? the other pages will stay?

Hello Łukasz,

Please check the tutorial here - https://nicepage.com/doc/67768/update-wordpress-theme
Theme update is not affecting the content part.

Let us know if any further assistance is required.

...................................................
Sincerely,
Anna.
Nicepage Support Team

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Follow us on Facebook: http://facebook.com/nicepageapp