If I scale it more, this empty space is more bigger. this other mirror part '-'..help me.. how can I make no space there
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1$\begingroup$ Check "clipping" and "merging" in your mirror modifier settings. $\endgroup$ – metaphor_set Feb 5 at 6:44
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From the looks of it you appear to be using a mirror modifier. To fix this tearing caused by scaling; enable "clipping" in the mirror modifier window.
Use the GIF below for an example: https://imgur.com/pZNoMDe