If your phone not support dark mode. You can easily make playstore with dark.Follow below steps. First Step, open Playstore and then click on top-left corner menu button. Second Step: After click on menu button. You can see menu list have Settings option. Click on it. Third Step: Now new page is open. and have one option that is Theme. Click on Theme Option. Fourth Step: After click on theme. You have two option Light and Dark. Click on Dark Option. and then your playstore app is in dark mode.