Hello Nada Essam

It is possible in controlpanel not in searchpanel
Here I am sharing a screenshot link so you will get more ideas

https://www.awesomescreenshot.com/image/24469102?key=66198fdb1a86fa119a3983ab1c1618ae

use select="multi" In multi, we can select several values with the use of checkboxes attribute to select multiple option and also you can find in base select="multi" so you will get multiple result
and you can refer below blog link

https://www.cybrosys.com/blog/create-search-panel-in-odoo-14

I hope this helpful for you.

Thanks & Regards,
Email: odoo@aktivsoftware.com
Skype: kalpeshmaheshwari