You can use the third party Kwin script "Force Blur" for this.
On Thu., Jul. 2, 2020, 7:50 a.m. Alex Gurenko, <agurenko(a)protonmail.com>
Hello everyone, I'm wondering if there is a trick how to enable
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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