Hello. Thank you for contacting the Toolset support.
This is a known issue to us and I've escalated the issue in front of our Devs and reported in front of them via our internal ticket system with all required information.
Please hold on for further updates, I'll get in touch with you as soon as I know more.
You will be able to see the update/save/publish button just behind the right sidebar and as soon as you will close the right sidebar you will be able to see the button.
*** Please make a FULL BACKUP of your database and website.***
Can you please update All Toolset plugins to it's latest official version and I hope this will resolve your issues.