I am using QGIS Version 3.10.0 . When using Map Composer I can not find the 'Set to map canvas Extent button'. When clicking on the extent tab The image below shows all the options I have.
Does anyone know why it is not there anymore?
QGIS – Where Has the ‘Set to Map Canvas Extent’ Option Gone in QGIS?
qgisqgsmapcanvas
Related Solutions
The scale will inevitably effect the extent for any given area and that will be limited by the size of your paper (so an A4 sheet @ 1:50,000 scale will be approximately a half of the possible extent of an A3 sheet). Contrariwise, setting the map extent for a given area of paper will also inevitable dictate the scale. You cannot adjust one without influencing the other (which is why you have received some negative scores for this question).
You have stated that your actual extent is not as important as scale. So to resolve your dilemma, set the scale and then, with the map selected, click the 'Move item content' button (icon is a small arrow and green box, next to the 'Select/Move item' button - a large arrow).
You can now 'slide' the content of the map without changing the position of the map on the page and thereby center you map contents on your area of interest.
If the extent of the map is still not large enough at the scale you must use, then you need to increase the size of the map and that might mean splitting your map over two or more sheets and to do that effectively you can use the Atlas generator.
This will return you the extent of the canvas.
extent = iface.mapCanvas().extent()
Reference: http://qgis.org/api/classQgsMapCanvas.html#a878f0c387c9475d59c6aac425db01020
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Best Answer
The location for these options has been moved to the top of item properties of your map. See: