Why lanthanides and actinides are shown separate from standard Periodic Table layout?

In the standard Periodic Table layout , all the elements upto 56 are in order i.e are in the same layout table. However, lanthanides and actinides are always shown separately from the layout like in this layout.

What is the reason behind this structure? Is this standard layout or can I represent like this this too ?

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The Periodic Table arranges elements in blocks as each type of orbital fills with electrons - $s,p,d,f,g,h$. Alkali metals and alkaline earths are $s$-block filling (but could be one $s$-block slot). $p$-block six electrons to fill are trelides, tetralides, pnticides, chalcogenides, halides, inert gases (but could be one $p$-block slot). Transition metal $d$-block is ten elements (but could be one $d$-block slot). Filling the $f$-block are 14 elements, lanthanoids and actinoids. That gets sloppy to print and the elements are (or at least were) overall obscure. They get condensed.

Representing the Periodic Table has become an an art form. The plain vanilla variety is terse and useful.

http://en.wikipedia.org/wiki/Alternative_periodic_tables

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Because if you put lanthanides and actinides in to the Periodic Table like transition metals, the table will be way too wide.

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The two rows of elements present at the bottom of the periodic table are called the 4f series or lanthanoids and 5f or actanoids. They are also called inner transition elements. With each series, the properties of component elements closely resembles each other so their chemistry becomes complicated than their corresponding lanthanoids. Actanoids have large number of oxidation states compared to lanthanoids. Actanoid are radioactive and are man-made in the laboratory. They are not completely studied. Hence they are placed separately in the periodic table.

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Also the actinides and lanthanides have very similar chemical behaviour- I think nearly all have a possible +3 oxidation state and similar metallurgical behaviour. For a long time, lanthanides was added as mishmetal to steel alloys.

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To preserve symmetry shape lanthanides are placed below main table .actually vertical elements are similar and horizontal elements are dis similar .but lanthanides shows horizontal chemical similarities so placed in f block

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Welcome to chem.SE. As I don't think you're referring to molecular symmetry, your answer seems a bit vague to me. It's better if you clarify your points and provide more examples. –  inɒzɘmɒЯ.A.M Jun 19 at 17:49