The goals completion % is now automatically calculated from any goals beneath it.

So if you don't have an option to update a goal %, and can only add a summary, like this:

That means there are sub-goals, which are feeding up to the % complete of the goal, like this...

Here's the 41% complete ⛺️ Basecamp goal (as shown in the example above):

This view highlights the 3x 🎯 Route goals, which are feeding up to make the 41% complete ⛺️ Basecamp goal:

Now we can see why the 'Design and Develop' 🎯 Route goal is 15%, because the 📋 marker below it is set to this!

Click into the sub goals beneath the goal you want to update, to access this panel: