remove unused themes

[hanhoe]

Hello,

how can I check, which themes are not used?

I have in Themes:

Magento Blank		Magento/blank
Magento Luma	Magento Blank	Magento/luma
Smartwave Porto	Magento Blank	Smartwave/porto
Smartwave Porto RTL	Smartwave Porto	Smartwave/porto_rtl
bigone_default	Magento Blank	bigone/bigone_default
bigone2	bigone_default	bigone/bigone2
bigone3	bigone_default	bigone/bigone3
bigone4	bigone_default	bigone/bigone4

As far I see in Design Configuration, bigone4 is used:

Default Website Store Store View Theme Name Action

Global				Magento Luma
Global	Main Website			Magento Luma
Global	Main Website	Main Website Store	Default Store View	bigone4

Because when I generate the static content, it takes a long time, because he made it for all and I want to delete old not used datas.

Can I delete?:

Magento Luma

Smartwave Porto

Smartwave Porto RTL

bigone2

bigone3

Or could it be, that some pages, sites or what ever are referencing to this themes?

Thank you!

[arunpraba]

It can be easily done by following steps

1. Remove the theme folder from app/design/frontend/<Vendor>/.
2. Clear the content of var/view_preprocessed/
3. Clear the content of pub/static/frontend/
4. Open the Magento’s database, go to the theme table then search and delete the theme row.
5. Clear the cache with php bin/magento cache:flush.