New lock UI option

@Luni, before I answer your questions directly, I’d like to explain what I understand of why we have two buttons.

From version 5.0.121 onwards, Gdevelop had only a single button that completely locked the instance in the scene. It was only possible to select it through the “Instances List panel” or by making a selection around that instance (which was probably a “bug” and at the time I opened a thread on Bug Reports). Print from version 5.0.121:

But in this way many novice users had difficulties, because after locking the instances they didn’t know that it was necessary to open the Instances List panel and select them there so that they could unlock them. I remember seeing a lot of posts with this kind of question here on the forum.

Then, in Gdevelop version 5.0.122 they changed how the “lock angle/position in the editor” works with the justification that it would be easier to unlock them:

This help to newbies created new difficulties that I tried to explain in my post that I have already quoted here: About the dificulties with "new" Lock position/angle in the editor - #4 by Gruk
And @VegeTato created this post that we’re in right now.

The solution then could not be to return to the original form of the lock position, as the newbies would have problems again. And that’s why we got a new button according to @alexandresi answer. This new button makes it clear that the instance will be blocked from being selected in the editor. So, that’s what I understand why we have two buttons. If you’re thinking about a change to a simplified form, I think you should take into account the difficulty that newbies have, as they usually don’t know that the Instance List is the place to unlock.

Now, answering why I use both options:

That’s not true. @VegeTato says:

And I like to lock some so I don’t accidentally move them and I don’t even notice.

For this question I agree again with @VegeTato: it’s much more convenient to unlock, but I think it’s good too that we can change some values and don’t need to unlock.