What are the logical reasons to place following action buttons at the left side or the right side of the form?
- For Mobile devices:
From a usability point of view on Mobile devices, it might be better to place them at the right. This is because most people are right handed ( Studies suggest that 88–92% of the world population is right-handed) and it is closer to reach it with the right hand thumb.
- For Desktop devices:
OSX and Windows as far as I know have such action buttons in Dialogs always on the right side so it probably makes sense to use the OS way of structuring the UI in Dialogs.
Also relevant but out of the question.
Material design Actions in Dialogs:
Dialogs present a focused and limited set of actions, which are generally affirmative or dismissive.
Affirmative actions are placed on the right side and continue the process. Affirmative actions may be destructive, like “Delete” or “Remove.”
Dismissive actions are placed directly to the left of affirmative actions and return the user to the originating screen or step in the process.
People tend to view the left side of the windows rather than the right side, so in my opinion that if your form has a very wide space the best option is the left one, but if your form in a small dialog you could choose between left/right side.
Web users spend 69% of their time viewing the left half of the page and 30% viewing the right half. A conventional layout is thus more likely to make sites profitable.