I can’t set a custom way to rearrange videos (eg. drag and drop) outside of these options and the modified option through the widget is not the same as the latest modified section in Vimeo.
Hello @user2759 
I am terribly sorry for all the frustration caused!
I’ve forwarded your request to our devs! I’ll immediately get back to you as soon as I receive any news!
Have a great day 
Hello @user2759!
Thank you for waiting!
Unfortunately, User video source type (for example eliseev ivan ) does not have manual sorting option
So, I’ve consulted with our devs and there is only one workaround in your use-case. You need to follow these steps:
- Create a new showcase and videos:
- Change the video order straightaway:
- Click on Share and add the link to the widget.
Please keep in mind that if you decide to change sorting again, it won’t be applied.
Could you please check it and let me know if it helped?