Configuring the text editor in Event Booking

hi,
Here is the situation:
1) TinyMCE is the default editor on my site.
2) There are users with "Author" permissions who add events to the site.
3) A simple toolbar set is selected in the TinyMCE settings for users with "Author" permissions.
4) However, when adding an event via Event Booking, TinyMCE opens with the extended toolbar.
Question: How can I ensure that users with "Author" permissions see the same toolbar—specifically, the simple set—when adding an event in Event Booking as defined in the TinyMCE plugin settings? I have attached a screenshot.

Hi Denis

Honestly, this is handled by Tiny MCE editor and I do not know how it is handled internal.

Could you please check to see if toolbar works well with Joomla core, for example, on Submit article form ?

Tuan