Hello,
Does anyone know how can I get automatically markers on a new path.

I create markers on existing paths and If I create and new path, there is no markers.
Is it possible to get them automatically created like the one I already created or to have a easy function to generate them?

Inkscape retains your fill, stroke and dash settings but forgets which marker you used. You can force it to remember by copy [ctrl+c] and paste style [shift+ctrl+c] without changing selection. The next path you draw will have the same markers.

I don't think this is intentional behaviour. Also, the style attribute expands unnecessarily, changing from this....

fill: none;
stroke: #c83737;
stroke-width: 2;
marker-end: url(#Diamond);

to this....

fill: none;
stroke: #c83737;
stroke-width: 2;
marker-end: url(#Diamond);
font-variation-settings: normal;
opacity: 1;
vector-effect: none;
fill-opacity: 1;
stroke-linecap: butt;
stroke-linejoin: miter;
stroke-miterlimit: 4;
stroke-dasharray: none;
stroke-dashoffset: 0;
stroke-opacity: 1;
-inkscape-stroke: none;
stop-color: #000000;
stop-opacity: 1;

It might be time for a bug report.

I filed a similar (but actually quite different) buggy 2 weeks ago. Buggy has been around since 2008. Style spam? Style bloat? 

https://gitlab.com/inkscape/inkscape/-/issues/5690

Bug report needed for the marker not being remembered


Edit 2: If using copy computed style, you will end up with style "spam". If using verbatim then no style "spam". 
 

It works (Verbatim and CTRL+C then Shift+CTRL+V on th new path).

It helps.

Thank you!

Marker setting should be remembered in last style used or is that a misunderstanding on my part? 

https://gitlab.com/inkscape/inbox/-/issues/4506