Fix: `show` for default `Extendablegrid` #376

Job	Run time
Documentation	14m 27s
Julia lts - ubuntu-latest - x64 - pull_request	6m 26s
Julia lts - windows-latest - x64 - pull_request	9m 44s
Julia lts - macOS-13 - x64 - pull_request	12m 1s
Julia lts - macOS-latest - aarch64 - pull_request	4m 29s
Julia 1 - ubuntu-latest - x64 - pull_request	12m 6s
Julia 1 - windows-latest - x64 - pull_request	14m 54s
Julia 1 - macOS-13 - x64 - pull_request	15m 1s
Julia 1 - macOS-latest - aarch64 - pull_request	9m 22s
Julia nightly - ubuntu-latest - x64 - pull_request	11m 55s
Julia nightly - windows-latest - x64 - pull_request	15m 7s
Julia nightly - macOS-13 - x64 - pull_request	20m 53s
Julia nightly - macOS-latest - aarch64 - pull_request	9m 23s
	2h 35m 48s

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