Theme customizations are made through native WordPress Customizer. In admin dashboard visit Appearance → Customize select the options group you want to customize and make the required changes.
Below is the main WordPress Customizer view showing all the options you can customize.
Also you can find the customizer options and values for the theme main demo.
This is the standard Site Identity section where you can upload your logo and favicon, set site title and tagline.
Define main theme colors here.
Choose to display a static page ot recent posts as your homepage. If you choose a static page, you can also add a table/grid at the top of it which you can configure here.
Header options such as colors, navigation menu styles, header layout and positioning.
Footer colors and copyright text.
Website font family. You can choose a system default font or one from Google CDN.
Here you define what Akurai sections look like and it'll affect almost everything including blocks and shortcodes.
Define link colors and
Theme button options such as colors, font styles, as well as hover effects and other styles.
A plenty of options related to reviews and review pages. You can specify Hero & Related Reviews section text contents, choose Hero layout, whether to display a featured image on review pages, as well as specify review logo sizes for better performance and rendering.
You can also enable/disable review/rating snippets (schema.org) markup for review pages, and adjust review author options.
Several options related to posts, blog and archive pages. First of all, you can disable featured images on single post pages. You can disable post meta data above the content (author, date) and below it (categories, tags, comments count) - this will affect not only single posts, but also blog page and archive pages such as category and tag pages.
You can also customize the layout of the blog page, by choosing to display it in a 2 column grid.
Specify shortcode options such as anchor texts and the number of review stars.
Read more about breadcrumbs here