How can I set a post thumbnail image without making a featured image?

This is your theme specific to show featured image in single post view.

I think you’re using Modern Style theme, just remove following code from single.php on line 14, now featured images only will be shown on tag/category archive pages (and I think on main page too ).

<?php if ( function_exists("has_post_thumbnail") && has_post_thumbnail() ) { the_post_thumbnail(array(300,225), array("class" => "alignleft post_thumbnail")); } ?>

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