AMP theme is not working in the Drupal 10 site (stable9 theme)

I have a site which is built using Drupal 10. Now I want to implement a AMP for our website only for the Article content type. We have a custom theme on the website and used stable9 theme as a

Basetheme

.

I have installed the Accelerated Mobile Pages (AMP) AMP → module on the site. And I have also done the configuration for the AMP module for the Article content type.

Now, I want well organised structure for a website, therefore a I have also installed the AMP theme → for the website. I select the any amp theme and install for the same to check for amp pages. I am able to access the AMP pages by adding

'?amp'

at the end of the url. But the theme are not in a structured manner.

Whenever I select any theme, the changes are not reflected and am facing a problem with setting up a structure.

for example

[ Theme - AMP theme
:Olivero AMP

Choose a theme to use for AMP pages. Themes must be installed (but not necessarily set as the default theme) before they will appear in this list and be usable by AMP. You can choose between AMP Base, an installed subtheme of AMP Base, such as the ExAMPle Subtheme, or any theme that complies with AMP rules. See AMPTheme for examples and pre-configured themes. ]

Please provide the suggestions or solution for the same issue.