LO6.4 Ubuntu Writer/Draw Rulers are very narrow

Just downloaded LO ver 6.4,

Ubuntu 18.04.4 LTS 64 bit

LO Version:

Build ID: b0a288ab3d2d4774cb44b62f04d5d28733ac6df8

CPU threads: 4; OS: Linux 5.3; UI render: default; VCL: gtk3;

Locale: en-IN (en_IN); UI-Language: en-US

Calc: threaded

For WRITER and DRAW documents, the RULERS are very narrow, and I cannot see any of the tab steps. Is there a way to change the width of the rulers. I read on the forum that some others had the opposite problem in earlier versions - Rulers were extra Wide.

I’ve removed earlier version of LO, so cannot post a comparison screenshot, but didn’t have this problem earlier.

I cannot confirm on my Ubuntu 18.04 LTS test system, but you seem to use some non-standard windows style setting (tweaked?). Do you face the problem even when starting and running LibreOffice in Safe Mode (Help -> Restart in Safe Mode ...)?

Same result in Safe Mode. I don’t think I’ve changed any windows style settings (no tweaks, I’m not a Power User). It’s a standard Ubuntu installation with GNOME 3 desktop.
Appreciate any further help on this.

Here’s the result when running LO in Safe Mode.