in Office365/Sharepoint Online is it somehow possible to get rid of the item information as you can see in the screenshot attached when an item is opened in dialog box?
the only compromise is to accept the Buttons (Save, Edit, Cancel,…) which are also located in the .ms-descriptiontext are gone as well but can still be accessed through the ribbon bar.
Use the developer tools to get the ID of the elements you want to hide by right clicking the item and select “inspect”. When you have the ID you can modify the CSS snippet to hide the new ID also.