Editing slide master triggers in project slides

It would be helpful to edit master triggers from the slide!

However, I assume that the programming involved would also require more effort than Articulate would want to put into such a feature, especially since there are workarounds. 

FYI: You can use a variable to control whether a Slide Master trigger runs or not. Any variable can be changed with a trigger on the slide. 

For example, a Slide Master trigger might run with the condition that the variable = True. Or a Slide Master trigger might run when the variable adjusts. The options you use depends on what you're trying to accomplish.  

Here are some resources that might help:

• PRIMER: Mastering the Slide Master | E-Learning Heroes 
• TIP: Master Toggling On and Off | E-Learning Heroes 
• TIP: Track Progress with Master Badges | E-Learning Heroes 
• The Value of Variables | E-Learning Heroes

By the way, the example you mentioned was "hide the next button until the end of the timeline." There's no need for a Slide Master trigger to prevent users from clicking Next until the timeline finishes. Instead, you can simply set the Player's navigation to Restricted. And you can override that restriction on any slide using other triggers. This post has details: TIP: Controlling the NEXT Button 101 | E-Learning Heroes.