Good ticket, thank you. Thanks for trying the current behavior.

The checkbox behavior in the ellipsis menu seems to be the primary source of confusion. Let's walk through how it could work instead:

• If a paragraph block says font-size is visible by default then the user should not be able to make it disappear ever. I.e. a default panel should never disappear on reset so the behaviour of reappearing on reselect is unnecessary.
• Resetting controls should have no effect on other blocks of the same type.
• Any control the user enables (like line height) is removed when reset.
• When an attribute is set on a block (either by user or pattern) it makes the corresponding tool appear for that block only.
• The only case a user would be able to affect default controls across a block type is through the global styles UI, not the block inspector.
• “Reset all” always just restores default appearance (so only default tools render)

For global styles and in the future, a user could be able to control default panels via theme.json just like themes can. In one such case, you might want to remove all controls by default on a paragraph. If you did that, the ellipsis would be replaced with a [+] icon to add controls when you need them.

One small thing as well: the ellipsis is vertical in recent global styles mockups, so we should update it here as well.

Premise: I have only been involved in the review of the ToolsPanel PR (and not in prior conversations).

To me, the main source of confusion is that the same interaction/piece of UI causes 2 separate outcomes: "visually show/hide a control", and "reset the control's value".

A better solution may be to have two clearly separate pieces of UI: one for toggling visibility, and one for resetting values. We should then only worry about making it clear to the user when a hidden control has a non-default (ie. that has not been reset) value.