Whenever you have one or more objects selected, the Object manipulation panel appears in the right panel.
Using the text inputs, you can quickly modify:
The scale can quickly be set back to 100% using the orange reset arrow button.
If you switch from World to Local coordinates, you can use 3 quick mirror buttons.
In the Advanced and Expert mode, a switch between Local and World coordinates becomes available.
The local coordinate system is constant in relation to the object. The world coordinates are constant in relation to the print bed. That means an object’s size will change in the world coordinates as you rotate it, for example, around the Z-axis. The size in local coordinates is constant no matter the rotation around any of the axes.
Local coordinates (left) vs World coordinates (right)