Regardless of whether you are an Editor or Publisher, you can preview your modified page for different device types.
You need to turn Edit Mode to Off at the top of the page to enter Preview mode:
If you wish to compare the previewed version with the current live version, you can click on Live page in the header. This will open the current site in a new window so that you can perform a side-by-side comparison before publishing your latest updates.
To change the language of the previewed page, select the language from the consumer drop-down highlighted above (refer also to How can Consumers change the page's language?).
Because you will have uploaded different versions of your adverts for different devices, it is important that you preview the page for both Mobile and Tablet devices, as well as PCs (Large screen).
Once you are happy with your edits, proceed according to your role, i.e.
If you are an Editor, click Share Preview at the top of the screen to email the revised page to a Publisher for final review and publishing.
If you are a Publisher, proceed as in Publish your Page.