I have a contour map which I have applied a symbology to add arrows pointing 'downslope' (defined by the average of adjacent line segment directions) by editing a linetype and adding markers.
I am now looking at editing the spacing of these markers to suit the map I am looking to produce and have run into a problem where I have lots of small/ short contour 'loops' which are being given their own direction arrow - but these are cluttering up the main topography of the site.
I would like to stop the shorter contours displaying as at the scale I am likely to be working these will not be visible (but their symbology arrows unfortunately are). I have added a length field and extracted the contour lengths, and I would like to filter the displayed features by a length.
Is this possible to achieve, ideally without Python/ PYQGIS as access to this is difficult (IT Policies etc.).
I realise I could copy the layer and manually delete the shorter features but I am after a more flexible solution which I could apply to future situations/ dynamically (i.e. if I decide to alter the cutoff value).
Windows 10, QGIS 3.8.2