I have downloaded and made first steps with modern Delphi 11 (community edition).
Compared to D6 / D7, I miss the possibility to have the palette be tabbed and multiline.
CNPack offers this option, but it's grayed out. Documentation does not give any details about this feature not being available anymore.
Is it possible to do at all ?
The two CnPack options you describe are disabled intentionally. Looking at the source code for that Settings window, they are both disabled in Delphi 8 and later:
{$IFDEF COMPILER8_UP}
// 8 以及以上版本无此设置
chkMultiLine.Enabled := False;
chkButtonStyle.Enabled := False;
chkDivTabMenu.Enabled := False;
{$ELSE}
chkMultiLine.Enabled := True;
chkButtonStyle.Enabled := True;
chkDivTabMenu.Enabled := True;
{$ENDIF}
Which makes sense, as the IDE UI underwent a major redesign in Delphi 8. A tabbed Palette simply isn't available anymore in modern Delphi. The Palette is now available only as a context-sensitive panel that is dockable alongside the code editor. It is no longer available as an embedded PageControl in the main toolbar.