Hi,
In this version, subcategories are displayed only after you select the main category and click the filter, then you will see subcategories according to the main category you have selected. If you need to show all categories, please check the solution in this topic: Show all sub categories in filter sidebar by default - #8 by moscato
Regarding the keyword search, please provide more details regarding this issue (e.g., your actions step by step with screenshots, etc.). This will help us to reproduce and resolve the issue faster.