Created attachment 140041 [details]
.png screenshot to illustrate the problem
On my Dell Latitude 5285 windows machine (Intel HD Graphics 620), when using OpenGL on LO 6.0.1 (which is the default behavior), there are many display problems (see attached screenshot): missing menu bar, missing status bar, blurry fonts, etc. Moreover, there is a shift between the position of the pointer and the UI object affected when you click.
Well, the Latitude 5285 sports a 12.3" display, so at native 1920x1080 resolution you are at ~180ppi, making this a HiDPI issue. But also have issue with the OpenGL drivers for the Intel HD 6xx GPUs as in bug 107764
clip and post result of msinfo32.exe System -> Component -> Display panel, so we can see the Intel driver.
And, then update to the current Intel graphics driver and retest, either Dell system specific , or Intel's "generic"  driver. If that resolves the OpenGL clipping this resolves dupe of bug 107764
 Dell's 4836 driver build
 Intel "generic" driver 4944 build (on laptop systems, the installer may balk)
 Intel instructions to install "generic" driver
Thanks for the tip!
Indeed, upgrading the video driver solved this issue.
Still, I find that the LO UI is quite slow with OpenGL (but that is another issue).
The output of msinfo32.exe is below (after upgrading the video driver):
Nom Intel(R) HD Graphics 620
ID de périphérique Plug-and-Play PCI\VEN_8086&DEV_5916&SUBSYS_07A41028&REV_02\3&11583659&0&10
Type de carte Intel(R) HD Graphics Family, compatible Intel Corporation
Description de la carte Intel(R) HD Graphics 620
Mémoire vive sur la carte 1,00 Go (1 073 741 824 octets)
Pilotes installés C:\Windows\System32\DriverStore\FileRepository\ki125882.inf_amd64_507c06df97b349dc\igdumdim64.dll,C:\Windows\System32\DriverStore\FileRepository\ki125882.inf_amd64_507c06df97b349dc\igd10iumd64.dll,C:\Windows\System32\DriverStore\FileRepository\ki125882.inf_amd64_507c06df97b349dc\igd10iumd64.dll,C:\Windows\System32\DriverStore\FileRepository\ki125882.inf_amd64_507c06df97b349dc\igd12umd64.dll
Version du pilote 22.214.171.12436
Fichier INF oem19.inf (section iKBLD_w10_DS_GTC)
Plans de couleurs Non disponible
Entrées de table des couleurs 4294967296
Résolution 1920 x 1280 x 60 hertz
Adresse mémoire 0xD0000000-0xD0FFFFFF
Adresse mémoire 0xC0000000-0xCFFFFFFF
Port d’E/S 0x0000F000-0x0000F03F
Canal IRQ IRQ 4294967285
Port d’E/S 0x000003B0-0x000003BB
Port d’E/S 0x000003C0-0x000003DF
Adresse mémoire 0xA0000-0xBFFFF
Pilote c:\windows\system32\driverstore\filerepository\ki125882.inf_amd64_507c06df97b349dc\igdkmd64.sys (126.96.36.19936, 12,80 Mo (13 422 528 octets), 19/12/2017 23:35)
*** This bug has been marked as a duplicate of bug 107764 ***