Linux Gnome launch bar - add favorite

Guys, I use the Nightly 5.99 in a Ubuntu 20.04.

Since some releases ago (if I remember, 1 week) I could not fix KiCad APP to the side bar anymore. Is this a bug? Someone already have it?

My other software still have “Add to Favorite” / “Remove from Favorite” option.

Application: KiCad

Version: 5.99.0-unknown-50fd94d35d~107~ubuntu20.04.1, release build

Libraries:
	wxWidgets 3.0.4
	libcurl/7.68.0 OpenSSL/1.1.1f zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.2.0) libssh/0.9.3/openssl/zlib nghttp2/1.40.0 librtmp/2.3

Platform: Linux 5.8.0-50-generic x86_64, 64 bit, Little endian, wxGTK, ubuntu, x11

Build Info:
	Date: Apr 27 2021 03:33:47
	wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
	Boost: 1.71.0
	OCC: 7.3.0
	Curl: 7.68.0
	ngspice: 31
	Compiler: GCC 9.3.0 with C++ ABI 1013

Build settings:
	KICAD_SCRIPTING=ON
	KICAD_SCRIPTING_MODULES=ON
	KICAD_SCRIPTING_PYTHON3=ON
	KICAD_SCRIPTING_WXPYTHON=ON
	KICAD_SCRIPTING_WXPYTHON_PHOENIX=ON
	KICAD_SCRIPTING_ACTION_MENU=ON
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON

I don’t know what that side bar thing is, but it may be related to:

Thank @paulvdh, I think yes…

Mint use KDE interface (“like Windows with start menu”) and Ubuntu use GNOME (“more like Mac-OS softwares bar”).