Follow the steps below to upload your site logo:
On the frontend, in the Admin bar, Customize.
On the backend, click Appearance » Customize.
Navigate to Site Identity section.
Click the Select Logo button to open the WordPress media library.
To upload the logo file, click the Upload Files tab in the upper left corner of the Select logo dialog box.
You can drag and drop any image file from your local computer or machine’s file manager, or you can click Upload Files to upload the logo file.
In the File Upload dialog box, navigate to the location of the image you want to use, and then double-click the image to upload it.
Once the file uploaded, the Media Library tab appears with the uploaded file selected.
At the right side of the Medial Library, complete the Title, Caption, Alt Text, and Description text boxes, and then click Select button.
The Crop Image dialog box appears.
Use the sizing handles to select any portion of the uploaded image you wish to be displayed as the site logo area, and then click Crop Image button. Suggested image dimensions: 400 by 140 pixels.
Click the Publish button to view the logo on your site.
Once a logo has been set, you can change or remove it using the Remove Logo and Change Logo buttons.
Right below the Logo media upload control within the Customizer section, you will see two additional toggle controls labeled as Site title and Tagline. By unchecking these toggle/slide fields site title and tagline can be removed either both or individually from the view.