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An existing company website that I am managing has an abandoned theme Stal theme not updated for more than a year 1 yr and 4 months. I will use the Hello Elementor theme instead. The old theme has four custom post types, taxonomies when I activated the hello theme all the four custom post types are still in the wp admin panel. I thought I have to move some php files and or edit the function.php but the CPT are still there?
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Check for a custom plugin. Usually, CPTs are stored in a plugin.