You can use the third party Kwin script "Force Blur" for this.

https://store.kde.org/p/1294604/


On Thu., Jul. 2, 2020, 7:50 a.m. Alex Gurenko, <agurenko@protonmail.com> wrote:
 Hello everyone, I'm wondering if there is a trick how to enable KDE blur on Yakuake background?
 I saw in git there were patches for Yakuake back when blur was introduced, but to this day being on latest updates-testing packages by Yakuake still uses old transparency rather than blur.

---
Best regards, Alex


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