Text added to 4K video project looks something like blurry (not sharp) when using rescale to 1080p in rendering window. The only way to fix that is to set project settings also to 1080p and than to render but then I have to also readjust effects becose Kdenlive does not automaticaly resize effects when changing project resolution (eg. transform). It is much loose of time if someone need to export the same video in 4K and also in 1080p resolution.