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I was very happy to see arrowheads introduced in the 1.7 update, but somewhat disappointed with the execution, in one important respect. Namely, the corners of arrows should be (slightly) rounded, or have the option to be rounded. 
For example, here is an arrowhead created by Designer (left), and one I drew (right). 
arrows.pdf
As proof that sharp arrows are a mistake, please look closely at the icon for the Selection and Node tools in Affinity Designer, both of which are rounded arrows.
Ideally, the solution would be to make an arrowhead a separate object (but somehow attached to a stroke), with their own fill and stroke. Then a sharp arrow would be an arrow with no stroke, and the rounded-ness could be controlled by adjusting stroke (and the color of an arrow could be different than the curve it's attached to---another missing feature at this point). Also, it would be nice to be able to adjust the width of an arrowhead, and arrowheads should (optionally) bend to match the curvature of the stroke they are attached to.
For now, I'll stick to making my own arrows, but I would love to see this fixed in a future release.

Sorry, by a toggle button I meant a button that stays on the screen (like the snapping toggle button lower left side), so the grid can be quickly toggle off and on. 
In general, it would be great to be able to customize what tools have dedicated on screen buttons.

With 1.7, when I exit out of a document then re-open, or when I open Designer and select a document I have previously worked on, the Grid is turned off. This did not happen in 1.6.
Also, it would be nice to have a grid toggle button somewhere, though that's more of a feature request.
I am running latest version of iOS, iPad Pro 11" with Pencil.
 
Thanks!

I was very happy to see arrowheads introduced in the 1.7 update, but somewhat disappointed with the execution, in one important respect. Namely, the corners of arrows should be (slightly) rounded, or have the option to be rounded. 
For example, here is an arrowhead created by Designer (left), and one I drew (right). 
arrows.pdf
As proof that sharp arrows are a mistake, please look closely at the icon for the Selection and Node tools in Affinity Designer, both of which are rounded arrows.
Ideally, the solution would be to make an arrowhead a separate object (but somehow attached to a stroke), with their own fill and stroke. Then a sharp arrow would be an arrow with no stroke, and the rounded-ness could be controlled by adjusting stroke (and the color of an arrow could be different than the curve it's attached to---another missing feature at this point). Also, it would be nice to be able to adjust the width of an arrowhead, and arrowheads should (optionally) bend to match the curvature of the stroke they are attached to.
For now, I'll stick to making my own arrows, but I would love to see this fixed in a future release.

I was very happy to see arrowheads introduced in the 1.7 update, but somewhat disappointed with the execution, in one important respect. Namely, the corners of arrows should be (slightly) rounded, or have the option to be rounded. 
For example, here is an arrowhead created by Designer (left), and one I drew (right). 
arrows.pdf
As proof that sharp arrows are a mistake, please look closely at the icon for the Selection and Node tools in Affinity Designer, both of which are rounded arrows.
Ideally, the solution would be to make an arrowhead a separate object (but somehow attached to a stroke), with their own fill and stroke. Then a sharp arrow would be an arrow with no stroke, and the rounded-ness could be controlled by adjusting stroke (and the color of an arrow could be different than the curve it's attached to---another missing feature at this point). Also, it would be nice to be able to adjust the width of an arrowhead, and arrowheads should (optionally) bend to match the curvature of the stroke they are attached to.
For now, I'll stick to making my own arrows, but I would love to see this fixed in a future release.