Hello RakeshChakraborty,
and welcome to this Apple user-to-user community!
Re: "... confirm with AssistiveTouch is not working on my phone 18 pro: I followed the process of switching this on but when I try to use it while app download or for Apple Pay, nothing happens when I tap the on screen floating button of AssistiveTouch".
Sorry I'm no expert on AssistiveTouch myself.
Yet your post to us deserves some response.
It seems the "on screen floating button of AssistiveTouch" should generally reveal a menu of options to choose from.
If you haven't already done so:Assistive Touch may need to be customised for yourself so you can perform the tasks you choose.
Apple support's linked article below may be helpful:
Use AssistiveTouch on iPhone - Apple Support
Eg: says:
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"Set up AssistiveTouch
Siri: Ask Siri something like, “Turn on AssistiveTouch.” Learn how to use Siri.
Or do the following:
(1) Go to Settings > Accessibility > Touch > AssistiveTouch.
(2) Turn on AssistiveTouch. The AssistiveTouch menu button
appears on the screen.
(3)To customize AssistiveTouch, tap any of the following:
- Customize Top Level Menu: Tap an icon to change its action. Tap
or
to change the number of icons in the menu. The menu can have up to eight icons. - Single-Tap, Double-Tap, Long Press, or 3D Touch: Assign custom actions that run when you interact with the menu button. 3D Touch is available only on supported iPhone models.
- Create New Gesture: Add your favorite gestures.
- Idle Opacity: Adjust the visibility of the menu button when not in use.
- Confirm with AssistiveTouch: On an iPhone with Face ID, confirm payments with Face ID by using AssistiveTouch instead of double-clicking the side button.
Tip: To quickly turn AssistiveTouch on or off, you can set up the Accessibility Shortcut, then triple-click the side or Home button.
_________________
Use AssistiveTouch
When AssistiveTouch is on, tap the AssistiveTouch menu button
, then choose an action or gesture.
To return to the previous menu, tap the arrow in the center of the menu. To exit the menu without performing a gesture, tap anywhere outside the menu.
To move the AssistiveTouch menu button, drag it to a new location on the screen.
For a multifinger gesture, do the following:
- Pinch and Rotate: Tap Custom, then tap Pinch and Rotate. When the two pinch circles appear, touch anywhere on the screen to move the pinch circles, then drag them in or out to perform a pinch or rotate gesture. When you finish, tap the menu button.
- Multifinger swipe or drag: Tap Device > More > Gestures, then tap the number of digits needed for the gesture. When the circles appear on the screen, swipe or drag in the direction required by the gesture. When you finish, tap the menu button."
If you need more help with using AssistiveTouch, you may want to reach out to the experts on Apple's Accessibility Support Team:
See: How to contact Apple for help with accessibility features - Apple Support
All the best :-)