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Ok, I am sorry because I am pretty new in all of this but I am sure that when I started to use WordPress Featured Images were showed in the top of the editor. And I do mean editor not Customizer.
I will ask at the theme’s support forum. Thanks a lot for your explanation.

Joy (@joyously) Howdy, I use the version 5.4.2 of WordPress, the Classic Editor and Blogzilla Theme (version 1.0.8). But i had this problem before changing the Theme (usig the default WordPress Theme). Thanks.

JNashHawkins (@jnashhawkins) Thank you, I will try it.