category dropdown

Hello,

First, thanks for this plugin.
I use the category dropdown and I have 2 questions,
When you choose a category, it works fine, but when after that you choose “select a category”, no event are displayed, is it possible after selecting a category to get back to the listing of all event?
Id like to also use [qem category=’name’] to only list 1 category on some page but without the dropdown, is it possible?

Thank you