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Simple question, what do you want to achieve multiplying one line 50 times? Do you want to create some feature or part?
Is this the Sketch environment when creating the part or Draft one?
Okay, so firstly, the correct method to create this is to create the first sketch for one feature - create it, then use the pattern command to do the rest for a created feature only - not for the sketch.
3. Pattern feature
besides the fact that in Solid Edge the policy was created to not pattern 2D geometry in 3D skecthes, the only way to approach and solve Your request is via a short detour to draft and back to 3D
See video, where a opened an empty draft, changed to 2D model space and have drawn the vertical line with 1m length AND followed by a rectangular pattern of 50 times in X with distance of 2500 by 1 times in Y with an distance
Copy the 2D result and paste it into the 3D sketch.
But remember that the best way anyway would be to create any 3D feature - which also can be a curve, maybe a section curve, a projected one etc., and pattern this in 3D part.
This way also provides an associative feature tree for that part, what means, that You can change any numbers and parameters at any time.