Normally the New, Details and Edit forms show the same data fields of the relevant object, with the exception of System Properties (not available in New form). However that may not be the case always. Take a look at the following image showing New and Edit forms for the same Object.
We can see that the Edit form has 9 fields (the System properties are in addition to that), while the New form has only 6 fields. There is a difference of 3 fields. Now if we add the Details page then keeping all in line with each other seems to be a daunting task.
We need to keep all three synced. One way to do so is to go to each form and manually make it like others. However, if a user updates any of the forms again, the problem may pop up again. The solution is the Sync Components option in the Form Builder.
Clicking on the Sync Components button invokes the relevant window.
Here the user can select the forms that they want to sync. Selecting the top option “Select All” would make all three sync.
To save the changes, choosing the Update Page option is required after any updates to the page/form.