An Introduction to Photo Editing with PhotoLine: Tips and Tricks
The toolbars are customizable. The default toolbar is General; you can edit it or create a new one (View Toolbars Custom Bar). Right-click a toolbar (any of the icons) and select Edit Toolbar. (Or Edit Options Usage Toolbars.) Select any menu entry, then click the double arrowhead button and a new button will be added below the selected one. Adjustment layers, Save as, and Web Export are good ones. You can also delete any of the default buttons.
When you paste a layer, layer handles are displayed by default. To hide them for the current document, click View Show Layer Handles. (You can add it as a button to the toolbar.) Unfortunately there is no way to change the default behavior.
To view an image with fewer distractions, click View Hide Panels/Show Panels. (You can add it as a button to the toolbar, but you cant use it after you hide it; the default keyboard shortcut is F11, which is also customizable via Edit Options Usage Keyboard Layout.)
The curve controls in the modal/popup tool and adjustment layer panels are not resizable; but you can zoom in on a curve while using Curves or the Hue Editor by clicking one of the curve control icons. This opens the Curve Editor, which is resizable up to screen size. It will not, however, display the colored backgrounds of the Hue curve, or Brightness or Saturation in the Hue Editor.
(If you are using the dockable adjustment layer panel, accessible via View Panels Adjustment Layer, that one is resizable; but only the width of the curve control increases, not the height. As it is the smallest option to begin with, I prefer the modal panel.)
When painting on a mask, partial opacity may be obtained by painting with white or black and reduced intensity. But repeated brush strokes will be additive. To paint with a solid gray color, double-click the foreground color field and select one. (If you right-click the number fields you can change them from Byte to Percent.) If you want to paint over white and leave black areas untouched, change the brush blend mode (Channels) to Darken. Change it to Lighten to paint over black and leave white untouched. (Remember to change the mode back to Normal when you are through!) Below is a mask with two gray brushstrokes, one set to Lighten and the other to Darken.
More tips: PhotoLine Quick Reference by Evren Comert.