Select a level tile, then click
. On the right side of the window that pops up, you'll see "Initial Level Setting Flags", among which you'll see "Enable Up/Down/Left/Right". Check those to enable paths to be walkable by default (you only have to enable it on one tile by the way; the "destination" level tile will open the path back automatically once Mario walks across).
Once you change that, though (or anything else in the "Initial Level Settings" box), you'll have to start a new save file to actually have them take effect.
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- SMW Glitch List
- SMW Randomizer