A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
After Animation is disabled because that setting is an after effect, not the mechanism used to make an object disappear with an Exit animation.
In PowerPoint, after effects apply to shapes that are already animated and then change state after they are built—for example, dimmed, hidden, or unchanged. The VBA documentation also notes that the after effect is only visible when the shape is animated and at least one other shape on the slide is animated after it.
If the goal is simply to make the object disappear when triggered, use an Exit animation itself. That is the supported way to remove the object from view.
Use this approach:
- Select the object.
- Go to Animations.
- Apply an Exit effect.
- Open Animation Pane to confirm the effect is listed.
- In the Start setting, choose how it should trigger:
- On Click to disappear when the slide is clicked
- With Previous to disappear with the prior animation
- After Previous to disappear immediately after the prior animation
- If needed, adjust Duration and Delay.
If the object must first appear and later disappear, add multiple animations to the same object:
- Select the object.
- On Animations, select Animation Pane.
- Select Add Animation and add the first effect.
- Select the same object again.
- Select Add Animation and add an Exit effect.
Important: after the first animation is applied, additional effects must be added with Add Animation. Otherwise, the existing effect is replaced instead of adding another one.
So the fix is not to enable After Animation, but to add or use an Exit animation for that object. The disabled drop-down is expected behavior for this scenario.