A question for players solving puzzles...

And how will I organize the outline? It is better to leave as is.

Organize the outline will be on the remaining sides, I'm in if the field Assembly will not throw palinki, the place will be free to build the puzzle and without button On the contour.

Leave it as is.

Just don't see the point. Who wants to, let him decide in the old interface.
Here's a panoramic puzzle you can remove the scrollbar and to save space - so it will be prettier and more convenient.

The examples in the top left corner, you can try live:
https://en.grandgames.net/index.php?place=ag&agurl=puzzles&sdir=show&id=173692&leftmode=1
https://en.grandgames.net/index.php?place=ag&agurl=puzzles&sdir=show&id=121119&leftmode=1

From the point of view of the player not so important in the upper left corner or center, you for some purposes the top corner of the principled? Then do as you easier, I think.

When the location of the center has a number of disadvantages
1. When you resize or scale the assembled image moves relative to the field for Assembly.
2. The big difficulty in implementing a multiplayer mode in defixionum the location field for the Assembly.
3. Still, although many years have passed, the old archaic functional more popular than new, I assume that it is connected with the field location for Assembly.

Then I "for" top-left corner.

Support @Lena2020, I like the upper left corner

I liked that field Assembly is not in the center - so the eyes have to "run" is not a circle, but only two sides Although I most likely would be the location field at the top right, it's like writing left to right, and "waving" the mouse in the same direction

And I would be more comfortable field for the Assembly in the upper right corner and in the upper left - a bunch of fragments.
@Support! Is it possible to implement the function "infinite" (enhanced) field Assembly, with scrolling right and down?
as well As the function of the same size fragments (the player) regardless of the size of the puzzle. Sometimes fragments of huge or too small, you need to spend time on the setup

I, too, for the top-left corner.
I have a suggestion: in small-sized puzzles (6x3, for example) to make the field for Assembly is not very large, accordingly the size of the pieces will also become smaller. Don't know how other players I've had at the beginning of the Assembly 6-7 times on reducing the size to press the parts to each other are not lying, then you can arrange the loop and then somehow it becomes clear that you collected. In a normal game it's not a problem. And if the tournament is wasting time.
Thank you.

I prefer the location in the upper left corner. Special thanks for caring to the point of view of the players.

If technically difficult in the upper right, then upper left is better than center.

center better, I add parts and is convenient to place them around the field
and I love that the puzzle was located in front of the eyes, not to mow in the corner
in the corner tried a couple of times in the old version and I did not come

In the old long-solved. Me at the center to collect much. Just easier to pick up sometimes in the slits, and that are caught, still do not collect

Leave it as is.