With the Charge theme for Shopify, you can edit the logo image and set the custom logo width.
Press the Header in a sidebar to see the Logo settings. When you click on the Edit button, you will see the popup where you can change the image and specify the Alt text.
Note: By default, the logo is shown on the left. You can change the logo position. Follow the instructions.
Note: You can also change the search bar view. Follow the instructions to show a search icon instead of the search field.