Hi jacolinedk

1)To generally change the color sof your bootstrap darkroom theme, you can edit the skin in the theme settings. You can do this in Configuration>themes. If you are after a more in depth customisation of the theme you can edit the CSS in the LocalFilesEditorPlugin. Using f12 will let you find the selector you need to then override the existing style in LocalFilesEditor.

2)In your piwigo administration if you go to configuration>Options>Display you can uncheck all the options you don't want displayed.

Hope this helps

Hi jacolinedk,

jacolinedk wrote:

I can not remove "calendar" in that drop-down (only on the menu)

You will find these option in Configuration> Options> display > Main page :
Activate icon "Display a calendar by posted date"
Activate icon "Display a calendar by creation date"

jacolinedk wrote:

I can not remove the 2 listing menues (no options for this)

As you say there isn't an option to hide these but the can be hidden using CSS with this code:

#btn-list,
#btn-grid{
display:none;
}

jacolinedk wrote:

I can not remove photosize even it is deactivated in setup (I do not want this cause of the lack of watermark in original image)

There is no reason for it to cause a lack of watermark on the original images

jacolinedk wrote:

I want the two bars in two diff. colors or removing the uppertop and then only one color for the second

You can select the top bar in css with this:
.navbar.navbar-expand-lg.navbar-main.navbar-dark.navbar-transparent.fixed-top

And the second menu bar can be selected using this:
.navbar.navbar-expand-lg.navbar-contextual.navbar-dark.navbar-transparent.navbar-sm.sticky-top