Split View unaffected by Set Window Properties As Default

[Traneptora]

If I set one channel to split view, right click that channel, and set window properties as default, it doesn't actually enable split view in other channels.

As shown here, split view is enabled with #kvirc:

However, after applying Set Window Properties As Default, nothing appears to have changed for #x264:

Possibly relevant info:

KVIrc 5.0.1 'Aria'
Runtime Info:
System name: Linux 5.8.4-arch1-1
System version: #1 SMP PREEMPT Wed, 26 Aug 2020 18:35:43 +0000
Architecture: x86_64
Qt version: 5.15.0
Qt theme: fusion
Build Info:
Build date: 2020-05-31 03:36:17 UTC
Sources date: 20200530
Revision number: 5.0.0-79-g4810f3f49-dirty
CPU name: x86_64
Build command: /usr/bin/cmake
Build flags: 
   MANDIR=share/man
   CMAKE_INSTALL_PREFIX=/home/leo/.local
   LIB_SUFFIX=
   Threads=POSIX
Compiler name: /usr/bin/c++
Compiler flags: -march=native -O3 -pipe -fPIC -Wall -fno-plt
Qt version: 5.13.2
Features: IRC, IPv6, Crypt, SSL, IfAddr, IPC, Transparency, Perl, Python, Enchant, GTK, Qt5, KVS
OpenSSL version: OpenSSL 1.1.1g 21 Apr 2020
OpenSSL compiler flags: compiler: gcc -fPIC -pthread -m64 -Wa,--noexecstack -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -Wa,--noexecstack -D_FORTIFY_SOURCE=2 -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -DOPENSSL_USE_NODELETE -DL_ENDIAN -DOPENSSL_PIC -DOPENSSL_CPUID_OBJ -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DKECCAK1600_ASM -DRC4_ASM -DMD5_ASM -DAESNI_ASM -DVPAES_ASM -DGHASH_ASM -DECP_NISTZ256_ASM -DX25519_ASM -DPOLY1305_ASM -DNDEBUG -D_FORTIFY_SOURCE=2
OpenSSL built on: Sun May 24 19:14:32 2020 UTC

[wodim]

iirc, setting properties as default means that new channels will get those properties; channels that you already opened once will not get those properties.

[Traneptora]

That's somewhat confusing. Is there a way to accomplish what I'm trying to do - which is apply current window properties to all windows?