Before using hashtags, please consider the following:
There are 30 hashtags in each box and you can see up to 100 hashtags by clicking .Instagram allows max. 30 Hashtags on a post and and up to 10 hashtags on a Story.
In Extended mode you can create a hashtag collection simply by clicking on the hashtags you like.
In simple mode you can click on the button to copy all the hashtags of that box and use it in your post.