Possibile issue with new Detail-todo feature

Hello
I'm not able to find the new Detail feature on Tickets section. I run the 9.1.1 version. 
In addition, I found a strange empty section on "Global parameter > todo list" (please see attachement), maybe these 2 stuffs are related together ...
I get this on both old and new graphical template, also after the cleaning of cache. 

My upgrade steps were:
> from 9.0.5 to 9.1.0
> from 9.1.0 to 9.1.1 

However, a​​​​​​After updating to 9.1.0 I faced the bug related to the "INSERT INTO `status` (`id`, `name`, `setDoneStatus`, `setIdleStatus`, `color`, `sortOrder`, `idle`, `setHandledStatus`, `isCopyStatus`, `setCancelledStatus`, `setIntoserviceStatus`, `setSubmittedLeave`, `setAcceptedLeave`, `setRejectedLeave`, `fixPlanning`, `setPausedStatus`) VALUES
(18, 'paused', '0', '0', '#BABABA', '350', '0', '0', '0', '0', '0', '0', '0', '0', '1', '1');". I've found this bug mentioned in the forum, it happens since I added a few new states during past months. I don't know if this bug could be related to the lack of todo list.

Anyway, my warmest congratulations on your wonderful software, which has greatly improved my way of working. 
Thanks

Hi. Many thanks for your immediate reply!
No errors in browser console, no error in the log files.

Hi babynus. 
Many thanks for the quick fix, it lets the todo-list setting to appear under "Global parameters > Activity" menu.

However, after putting this flag to "Yes", still no todo section on Tickets or Activities (new or existing one).
I've performed a logout/login, I've tried with both old an new graphical interface. I've cleaned the cache. I've checked log files, no error. Also no error on Js console.

Maybe there is an additional permission to authorize and I do a mistake in this?
Best regards