Hi Xtom first the filter you have selected in the screenshot is a photo filter it's not meant to be used as a seamless tile. Filter forge is capable of producing many effects and depending on what the filter author is trying to achieve they don't always tile seamlessly. The grunge filter can be applied to a selection in Xara with out the semi transparent margin if you tweak the filter and add a couple of components in the filter editor.
First In xara create a rectangle over your image that you want to apply the grunge to. Give this rectangle the colour you wish for your grunge.
With this rectangle selected go to your live effects and go to filter forge, one the filter forge window opens and you have the grunge filter open click open filter editor in the upper right ( don't worry you will be editing a copy of the filter so you won't lose the original if things go wrong, not that they will this is actually very easy)
Once you are in the filter editor open the components panel by clicking the components button. click external and drag an image component to the workspace near the result
click adjustments and drag a gamma component to the workspace
click Channels and drag a Set Alpha component to the workspace
Ckick and drag from the green triangle on the image component and "plug it in" to the source input on the gamma component.
Plug the gamma into the Set Alpha component in the same way
Click controls and drag a slider control into the workspace and plug it in to the gamma input of the gamma component you can name this control opacity or something like that. By controling how the gamma affects the externa image that is your selected image in Xara you can control the opacity of your grunge layer.
Click save filter and name your tweaked filter click apply to apply the filter and go back to Xara. Once the filter has been applied lock it by clicking the lock icon on the info bar. Currently All Filter Forge filters must be locked in Xara to avoid an error when Xara tries to redraw the effect. This has been reported to Filter Forge and last I heard they are working on a fix
This tweaked filter still won't be seamless because of the way it's set up to frame the image, but you can find some filters like this one that do produce seamless results.
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