I saw this in a recent video for how selections work (I assume this isn't just zones, but selections in general):
This is great, but it would be useful if there were somewhere displaying how large this dragged out area is (that goes for any designation in general), either as a tooltip on the side of the box, or in a fixed position somewhere, and possibly beside this, the absolute number of how many squares there are (for the mathematically lazy).
For example, in the above image, it would be 11x18 (or the other way around; I can't remember whether vertical or horizontal comes first), and also 198 squares. Obviously this information would also be shown for placing/building of objects or constructions, and maybe when selecting already existing zones as well (so you can see at a glance for example, how big a zone or a farm is)
Maybe this is already planned though.
There could be also be a toggle option to show the numbers of each tile (distance from the corner being dragged from) instead of the green diamond shapes, showing the distance from the initial point being dragged out (starting with 1, not 0).
Another QOL feature to consider (as an option) is highlighting the line of squares down the middle on each side (assuming that side
has a middle/isn't an even number), for example, something roughly like this, but better looking/clearer than my quick edit:
The vertical side is 18 tiles so it doesn't have a middle to highlight (or maybe there could be a line in between the 2 middlemost tiles?), but if it was, it would also have a highlighted line of dots, and so you would also see the middle of the rectangle by where the lines meet.