Here is the answer of your each questions :
Q: How can I tell what version of SharePoint my "personal site" is running? I suspect "SharePoint 2016", On-premises. How can I tell?
Answer: To get SharePoint on-premise version type the below URL in the browser.
To check the version of SharePoint Online, use below ...
You can rearrange the order of fields by list settings-> change column ordering...it will re-order fields in forms...
You can also hide column using list settings - use below link
For any other customization, You can modify forms pages by add content editor webpart to all 3 forms and use jquery ...
I think this is not possible by the tool, here is a reply from ShareGate though it is a year old :
April 26, 2019
I am glad to say that we are currently exploring the possibility to add an option to automatically make Read-only and/or Delete the source of migration if it goes errorless.
We’ll keep you updated with any news on this.
Out of the box, you can only add a filter on "[Me]" - so if the current user is the member of any group, then the [Me] keyword filter won't work. however, if you want to apply the filter on the SharePoint group you need to open the view in SharePoint designer and do the necessary changes.
Try following these steps:
Create a new view, and open the ...